PSRS SS Part B

Monthly and annual Petroleum Supply Reporting System (PSRS) surveys are used to collect data on the primary petroleum supply system in the United States including U.S. territories and possessions, where applicable. Primary petroleum supply system activities covered by PSRS surveys include refineries, imports, pipelines, large storage facilities and those connected to bulk transportation modes (i.e. pipelines and waterborne transport of crude oil, petroleum products, and biofuels), natural gas processing, oxygenate production, biodiesel production and bulk transportation (i.e. transport by pipeline, tanker, and barge) between Petroleum Administration for Defense Districts (PADDs). Data on other primary petroleum supply activities, including field production of crude oil and exports, are obtained from other sources including state and federal agencies.

Each monthly and annual PSRS survey is a complete census of the subject activity. Therefore, there is no sampling error in monthly and annual PSRS surveys. However, in order to be considered as in-scope for monthly survey reporting, each reporting unit must have reportable quantities (usually this means at least 500 barrels of a reportable product) or satisfy other criteria such as minimum storage capacity requirements for petroleum products terminals. Facilities that fall below minimum reporting requirements are considered to be outside of the primary petroleum supply system and, therefore, out of scope for monthly and annual PSRS reporting.

The following are descriptions of the survey frame for each survey:

Form EIA-810, “Monthly Refinery Report”: Form EIA-810 must be completed by operators of all operating and idle petroleum refineries located in the 50 States, District of Columbia, Puerto Rico, the Virgin Islands, Guam, and other U.S. possessions. Data are reported by refinery site. Refineries are installations that manufacture finished petroleum products from crude oil, unfinished oils, natural gas liquids, other hydrocarbons, biofuels, and oxygenates. Refiners report distillation capacity, crude oil quality, inventory, receipts, input, production, shipments, and fuel use and loss. Refiners report storage capacity for the months of March and September.

Form EIA-812, “Monthly Product Pipeline Report”: Form EIA-812 must be completed by every product pipeline operator in the 50 states and District of Columbia. Data are reported by company and PADD. Product pipelines are used for transportation of petroleum products as well as selected biofuels and oxygenates. Product pipeline operators report stocks held in pipelines and associated tanks and inter-PADD movements. Pipeline operators report storage capacity of tanks and underground storage associated with product pipelines for the months of March and September.

Form EIA-813 “Monthly Crude Oil Report”: Form EIA-813 must be completed by operators of facilities, and for activities, located in the 50 states and District of Columbia that carry (transport) or store at least 1 thousand barrels of crude oil. Data are reported by company and PADD. Facilities and activities reported on Form EIA-813 include:

crude oil production sites where lease stocks are held
crude oil storage terminals and tank farms
crude oil pipelines
Alaskan crude oil in transit by water from Alaska to the 50 states and District of Columbia.

Reporting on Form EIA-813 includes stocks held on producing leases, as well as stocks in pipelines, tanks, and underground caverns. Pipeline operators report inter-PADD movements. Shippers of Alaskan crude oil by water report barrels in transit between Alaska and the 50 states and District of Columbia. Operators of storage terminals and tank farms report storage capacity for the months of March and September.

Form EIA-814 “Monthly Imports Report: Form EIA-814 must be completed by every importer of record (or the ultimate consignee in some situations involving imports from Canada) of crude oil, petroleum products, and biofuels. Importers and ultimate consignees are identified on the following documents filed with U.S. Customs and Border Protection (CBP) and the U.S. Department of Commerce:

CBP Form 7501, “Entry Summary”
CBP Form 214A, “Application for Foreign Trade Zone Admission and/or Status Designation”
Department of Commerce Form 7525-V, “Shippers Export Declaration”

Reported imports include barrels of foreign origin that enter the 50 states and District of Columbia as well as U.S. territories and possessions, including Foreign Trade Zones. In addition, imports from U.S. territories and possessions to the 50 states and District of Columbia are reported on Form EIA-814. Reporting on Form EIA-814 includes the country of origin, port of entry, type of commodity, quantity imported, sulfur and API gravity for crude oil and selected products, and processing facility for crude oil and selected unfinished products.

Form EIA-815 “Monthly Bulk Terminal and Blender Report”: Form EIA-815 must be completed by every operator of a bulk terminal located in the 50 states, District of Columbia, and U.S. territories and possessions. Data are reported by bulk terminal site. Bulk terminals are storage facilities where petroleum products and biofuels are stored in tanks and/or underground caverns. Some bulk terminals are used for product blending, where unfinished and finished petroleum products and biofuels are blended in lines or in tanks to produce new or reclassified products (e.g. blending fuel ethanol with unfinished gasoline to produce finished gasoline). Bulk terminals reported on Form EIA-815 include facilities that have storage capacity of at least 50 thousand barrels and facilities with storage capacity less than 50 thousand barrels that receive or ship product by pipeline, tanker, or barge. Petroleum products storage facilities that have less than 50 thousand barrels of storage capacity and receive and ship product only by rail and truck do not report on Form EIA-815. These smaller petroleum products and biofuels storage facilities are sometimes called “bulk stations” to distinguish them from bulk terminals. Bulk stations are considered to be outside of primary petroleum supply channels and so they are excluded from reporting on Form EIA-815. Bulk terminal operators report inventory, receipts, input, production, shipments, and fuel use and loss. They report storage capacity for the months of March and September.

Form EIA-816 “Monthly Natural Gas Plant Liquids Report”: Form EIA-816 must be completed by every operator of natural gas processing plants, natural gas plant liquids fractionators, and butane isomerization plants in the 50 States and the District of Columbia. Data are reported by plant. Natural gas processing plants extract natural gas liquids from a stream of natural gas. Natural gas liquids fractionators separate natural gas liquids into individual components (i.e. ethane, propane, normal butane, isobutane, and pentanes plus). Butane isomerization plants convert normal butane to isobutane. Form EIA-816 must be completed by operators of all natural gas processing plants that produce at least 500 barrels per month of at least one natural gas plant liquids component. Operators of natural gas plant liquids fractionators only report stocks and are only required to file Form EIA-816 if their plant or plants hold stocks (most fractionators do not hold stocks). Form EIA-816 must be completed by all operators of butane isomerization plants that convert at least 500 barrels per month of normal butane to isobutane, except in cases where a butane isomerization plant is part of a refinery and butane isomerization activity is reported on Form EIA-810.

Form EIA-817 “Monthly Tanker and Barge Movements Report”: Form EIA-817 must be completed by companies that move crude oil, petroleum products and biofuels by tankers and barges between Petroleum Administration for Defense Districts (PADDs) that include the 50 states and District of Columbia (i.e. PADDs 1-5). Movements that are entirely within one PADD are not reported. Reporting is by commodity, origin PADD, and destination PADD for each reporting company without regard to specific refinery, terminal, or port locations. Movements from the U.S. Gulf Coast region (PADD 3) to the U.S. East Coast Region (PADD 1) are further subdivided in terms of destination as New England (PADD 1A), Middle Atlantic (PADD 1B), and South Atlantic (PADD 1C).

Form EIA-817 must be completed by companies that have custody of crude oil, petroleum products, and biofuels transported by tanker and barge between PADDs. Reportable movements include those that originate in one PADD and are then transported to the Panama Canal and, then, proceed from the Panama Canal to another PADD. Custody is defined as physical possession of crude oil, petroleum products, or biofuels on a company-owned tanker or barge. Companies that lease vessels or contract for movement of crude oil, petroleum products, or biofuels by water between PADDs are also considered to have custody. Companies reporting on Form EIA-817 are typically refiners and/or marketers of crude oil, petroleum products, and biofuels. Form EIA-817 reporting companies are waterborne shippers rather than carriers (i.e. operators of tankers, barges, and tug boats), except in cases where refiners and marketers are also vessel operators.

Form EIA-819 “Monthly Oxygenate Report”: Form EIA-819 must be completed by operators of facilities in the 50 states, District of Columbia, and U.S. territories and possessions that produce (manufacture or distill) oxygenates that have fuel applications. Data are reported by plant. Oxygenates reported include fuel ethanol, Methyl Tertiary Butyl Ether (MTBE), Ethyl Tertiary Butyl Ether (ETBE), and “other” oxygenates. Oxygenates mayalso be biofuels (e.g. fuel ethanol and bio-ETBE). Because the production of biofuel oxygenates is experiencing significant change and innovation, the category “other” oxygenates is used to capture data and monitor development and supply of new oxygenate products as they enter fuel markets. Reported facilities include merchant plants as well as plants associated with refineries and petrochemical facilities. Monthly reports include quantities produced and stocks. In addition, fuel ethanol producers report gasoline blending at ethanol plants and petroleum products blended with ethanol as denaturants. Fuel ethanol producers also report nameplate capacity of their plants with their January reports and fuel ethanol storage capacity for the months of March and September.

Form EIA-22M “Monthly Biodiesel Production Survey”: Form EIA-22M must be completed by operators of facilities in the 50 states, District of Columbia, and U.S. territories and possessions that produce biodiesel that meets ASTM D 6751-07B specifications and is used for commercial purposes. Data are reported by plant, and reported data include production capacity, stocks, production, receipts, shipments, sales, and feedstocks.

Form EIA-820 “Annual Refinery Report”: Form EIA-820 must be completed by operators of all operating and idle petroleum refineries located in the 50 States, District of Columbia, Puerto Rico, the Virgin Islands, Guam, and other U.S. possessions. The Form EIA-820 survey frame is normally identical to the survey frame of Form EIA-810, though there are cases where differences arise, such as during periods when a refinery is in transition from operable to shut down. Data are reported on Form EIA-820 by refinery site. Refineries are installations that manufacture finished petroleum products from crude oil, unfinished oils, natural gas liquids, other hydrocarbons, biofuels, and oxygenates. Reports are filed each year in February. Refinery operators report fuel, electricity, and steam purchased and consumed, and crude oil received by method of transportation at the refinery during the prior year. Operating, idle, and total operable (sum of operating plus idle capacities) capacities of atmospheric crude oil distillation units are reported for January 1 of the current year and operable distillation capacity is projected for January 1 of the following year. Downstream charge (input) capacities are reported for selected process units as of January 1 of the current year and projected for January 1 of the following year. Production capacities of selected refinery units are reported for January 1 of the current year and projected for January 1 of the following year.

Weekly PSRS Survey Frames: The EIA weekly reporting system, as part of the PSRS, was designed to collect data similar to those collected monthly. The samples of companies that report weekly in the Weekly Petroleum Supply Reporting System (WPSRS) are selected from the universe of companies that report on the corresponding monthly forms. The following describes the relationships between the samples for the weekly PSRS surveys and the corresponding monthly survey that provide the universes of companies for sampling:

Form EIA-800 “Weekly Refinery Report”: The universe of possible reporting units is provided by Form EIA-810 for refineries and Form EIA-816 for natural gas liquids fractionators. It is important to note that fractionators report production data on Form EIA-800 collects and report only ending stocks data on Form EIA-816. Therefore, there are fractionators reporting on Form EIA-800 (because they have production) that do not report on Form EIA-816 (because they have no stocks).

Form EIA-802 “Weekly Product Pipeline Report”: The universe of possible reporting units on Form EIA-802 is provided by Form EIA-812.

Form EIA-803 “Weekly Crude Oil Report”: The universe of possible reporting units on Form EIA-803 is provided by Form EIA-813.

Form EIA-804 “Weekly Imports Report”: The universe of possible reporting units on Form EIA-804 is provided by Form EIA-814.

Form EIA-805 “Weekly Bulk Terminal and Blender Report”: The universe of possible reporting units on Form EIA-805 is provided by Form EIA-815. The sample size of companies reporting on Form EIA-805 will be expanded in 2013 to account for stocks previously reported on Form EIA-801. Information reported on Form EIA-805 prior to 2013 was limited to blending activity data.

Form EIA-809 “Weekly Oxygenate Report”: The universe of possible reporting units on Form EIA-809 is provided by Form EIA-819.

Monthly Frames Maintenance: All of the monthly and annual PSRS surveys have established frames that require maintenance. Survey frame maintenance is conducted on a continuous basis or periodically, as source information becomes available.

EIA obtains considerable information for continuous frame maintenance through routine contacts with survey respondents to discuss data quality issues. In general, entrance and exit of firms from capital intensive industries, such as oil refining, storage, pipeline transportation, and biofuels production, are well-covered by industry media and the general media, which are important sources of information for PSRS survey frame maintenance. Media reports are commonly supplemented by discussion with knowledgeable people in the industry who either contact EIA to discuss matters related to data, or who work with EIA on statistical issues and methodology through trade associations and other organizations. The following are additional specific sources of frame maintenance information for PSRS surveys:

Data files are provided to EIA by U.S. Customs and Border Protection (CBP) and the U.S. Census Bureau that identify importers of crude oil, petroleum products, and biofuels. These files are provided to EIA for the purpose of maintaining the survey frame of Form EIA-814, “Monthly Imports Report,” through inter-agency agreements.
The U.S. Internal Revenue Service (IRS) assigns Terminal Control Numbers (TCNs) to petroleum products storage terminals and many refineries as part of their Excise Summary Terminal Activity Reporting System (ExSTARS) program. The TCNs are posted on the following page of the IRS website https://www.irs.gov/Businesses/Small-Businesses-&-Self-Employed/Terminal-Control-Number-TCN-Terminal-Locations-Directory. EIA asks survey respondents to provide their TCN when submitting PSRS survey reports to facilitate matching with the IRS TCN list. EIA examines differences between PSRS survey frames for bulk products terminals and refineries and the IRS list of TCNs to identify potential additions or changes to EIA survey frames.
The “LPG Almanac,” published by Sulpetro (http://www.sulpetro.com/), is a valuable resource for identifying companies and facilities that handle and/or process to natural gas plant liquids and liquefied refinery gases. These facilities include natural gas processing plants, natural gas liquids fractionators, isomerization plants, refineries, pipelines, and storage facilities.
The Renewable Fuels Association (RFA) is a trade association that provides a list of “biorefinery” plants on their website (http://www.ethanolrfa.org/resources/biorefinery-locations/). This list is useful to EIA for identifying fuel ethanol plants to be included on Form EIA-819, “Monthly Oxygenate Report.”
The National Biodiesel Board (NBB) is a trade association that provides a list of biodiesel plants on their website (http://www.biodiesel.org/production/plants). The NBB list of biodiesel plants is useful to EIA for identifying biodiesel producing companies and plants to be included on Form EIA-22M, “Monthly Biodiesel Production Survey.”
Federal agencies that provide information useful for PSRS frame maintenance include the U.S. Environmental Protection Agency Facility Registry System (http://www.epa.gov/enviro/html/fii/fii_query_java.html) and the U.S. Department of Transportation National Pipeline Mapping System (https://www.npms.phmsa.dot.gov/).
Additional frame information is obtained through industry directories including the “Petroleum Terminal Encyclopedia,” published by OPIS/Stalsby, and the International Liquid Terminals Association (ILTA) “Terminal Member Directory.”

Sampling Methodology and Estimation Procedures
1. Sample Design

The sampling procedure used for all the weekly surveys is the cut-off method. In the cut-off method, companies or sites (depending on the survey) are ranked from largest to smallest on the basis of quantities of each product reported on the equivalent monthly survey for the most recently published survey month. Companies are chosen for the sample beginning with those reporting the largest volumes on the most recently published monthly survey and adding companies until the total sample covers approximately 90 percent of the total volumes for each item and each geographic region for which monthly data has been last published.

To ensure a sufficient coverage (90 %) of the total volume for each item collected and each geographic region for each weekly survey, a sample control meeting is conducted each month. This meeting focuses on changes in the current monthly frame due to sales, acquisitions, mergers, new reporters, reactivations, and reporting units that have become inactive. Companies are added or removed from the weekly samples, based on the changes.

Imputation and Estimation Procedures

Forms EIA-800 through EIA-809: In any survey, non-response can be a major concern because the effects can cause serious bias in survey results. Non-response occurs whenever requested information is not obtained from all units in a survey frame. Whenever PSRS survey responses are not received in time to be included in published statistics, the data are imputed. Although imputing for missing data may not eliminate the error associated with non-response, it can serve to reduce this error.

After responding entities’ survey responses have been validated and entered into the weekly database for the Forms EIA-800 through EIA-809, individual response item values are imputed for companies that have not responded, reported incomplete data, or reported data that failed editing and could not be confirmed. The imputed values are calculated using the exponentially smoothed mean values of recent weekly reported values for a specific responding entity.

The equation for the exponential smoothing is:

Y_t+1 = α * y_t + (1 - α) * Y_t-1

Where Y_t+1 is the response item-level prediction for reporting week t+1 (using data through week t),

y_t is the previous week's reported value (or imputed value, if the response was imputed for week t),

Y_t-1 is the value that was generated by the equation for reporting week t-1, and

α is a number between 0 and 1, chosen specifically by survey/product/type

In the equation for exponential smoothing, the size of α controls the importance of the previous reporting week’s reported value relative to the aggregate of all prior weeks’ reported values as represented by the prediction for the previous week. For example, if α = 0.8, then the previous week’s value is much more important in predicting this week’s value than all the previous week’s values, because the weight of last week is 0.8, which is greater than the weights of the previous weeks (powers of 0.2.). In general, the α values are low for imports measured by the Form EIA-804 (where the previously reported week’s value is much less important than history) and much higher for the other surveys which measure production, inputs and stocks.

Next, the imputed values are treated like reported values in the estimation procedure for published aggregated data. The estimation procedure uses ratio estimates of the weekly totals to produce published totals, as is described below.

First, the current reporting week’s data for a given product reported (or imputed) for each entity in a geographic region are summed (weekly sum, W_s.). Next, the most recent complete reporting month’s data for the product reported (or imputed) for those same respondents are summed (monthly sum, M_s.). Finally, the most recent complete reporting month’s data for the product as reported by all respondents, including adjustments made in the monthly process, are summed (M_t). The current week’s ratio estimate for that product for all respondents, W_t, is given by:

W_t= (M_t / M_s) * W_s

The ratio (M_t / M_s) may be adjusted on rare occasions to account for very unusual events or industry changes not yet reflected in the lagged monthly data. For example, the hurricanes in September 2005 rendered the September data (published at the end of November 2005) unrepresentative for purposes of applying the ratio to the Weekly Petroleum Status Report in December 2005.

The W_t’s are used directly to estimate total weekly inputs to refineries and production. To estimate stocks of finished products, the W_t’s are independently calculated for the establishments of refineries, bulk terminals, and pipelines. Estimates of totals are calculated by summing over the establishment types.

Weekly imports data are highly variable on a company-by-company basis or a week-to-week basis. Therefore, an exponentially smoothed ratio is used for estimating weekly imports. The estimate of total weekly imports is the product of the smoothed ratio and the sum of the weekly reported values and imputed values.

For imports, the ratios are smoothed as follows:

R_t+1 = γ * r_t + (1 - γ) * R_t-1

where R_t+1 is the smoothed ratio for reporting week t+1 (using ratios through week t),

r_t is week t's ratio of the most recent complete monthly total for all respondents to the monthly total of respondents from the weekly sample,

R_t-1 is the smoothed ratio for week t (using ratios through week t-1),

γ is a number between 0 and 1, chosen by product, and is the same for all PADDs and Respondent IDs for that product.

When M_s = 0, then r_t is not defined for the reporting week, and the smoothed ratio is not updated (i.e., the previous smoothed ratio is used as the multiplier).

Forms EIA-810 through 813, 814, 815, 816, 819, and 22M: Response rates for the forms are generally 99 to 100 percent, necessitating less frequent data imputation. For these data collections, the data reported in the previous month can be used as imputed values for missing data, unless there is reason to believe that another value would provide a more reasonable estimate (e.g. based on weekly reporting or other information about a facility that would be likely to influence the data, such as down time at a refinery). Data are rarely imputed for the Form EIA-817 because the data at the respondent level are highly variable across weeks. The reason for this high variability is that tanker and barge movements tend to be somewhat opportunistic and highly dependent on market conditions. Hence, there is a relatively high incidence of reporting of zero or blank as legitimate values. So not imputing (i.e. leaving data cells empty for non-responses) is believed to be the best means of addressing non-response on Form EIA-817.

Imputation Resulting from Macro Level Data Analysis

EIA-800 through 809: After the item level respondent data flagged as having failed data validation rules have been edited or validated as being accurate, preliminary tables of aggregated response data are produced and used to identify data trend anomalies at a macro level. These tables show U.S. and PADD estimates for the current reporting week and the prior 3 reporting weeks and also show year-ago data for the same calendar reporting week along with an average of the four most current reporting weeks.

Anomalies are identified by analyzing each product’s aggregate volume and the individual supply-type components’ volumes that comprise that product (production, inputs, imports, stocks) by identifying whether those components fall within relevant historic ranges specific to each product and supply- type for each PADD. Anomalies result in further review of respondent data at the micro level which, in turn, may result in additional flagging of data for review and further imputation of flagged responses.

EIA-810 through 819 and 22M: After the flagged respondent data have been resolved, preliminary tables of aggregated response data are produced and used to identify anomalies. These tables allow EIA analysts to develop various views of the data in the context of other related data (e.g. examining stock changes and imports) as well as historical estimates for the U.S. and by PADD. Anomalies identified through this process lead to further review of respondent item level data which, in turn, may result in further review of respondent data for additional validation and/or possible imputation.

Efforts to Improve Data Accuracy

The reliability of data is subject to two types of possible errors: non-sampling errors and sampling errors. Sampling errors occur for the weekly surveys because observations are made only for a subset of the population, not for the entire population. Non-sampling errors occur for all surveys and can be attributed to many sources in the collection and processing of data, such as incomplete frame coverage, a difference in interpretations of definitions or questions, mistakes in recording or coding the data from respondents. The accuracy of survey results is determined by the joint effects of sampling and non-sampling errors. Response error, or reporting error (that is the difference between the true value and the value reported on a survey form), is typically the major component of the total survey error for all surveys covered by this OMB package.

To aid in detecting and minimizing response errors, automated data validation procedures are used to check current data. These checks include verifying the current data for consistency with past data, for internal consistency (e.g. totals equal sum of parts), examining orders of magnitude, and cell position. Data elements that fail validation criteria are flagged for manual review and possible editing.

Monthly and weekly data are compared on a regular basis to rectify discrepancies in data. In addition, a comparison of PSRS data with sources outside of the Petroleum Division is performed each year.

Methods to Maximize Response Rate

To maximize response rates, data collection forms are designed to be easily completed, and instructions are written to be clear, concise, and easily understood. Forms and instructions are made available on the EIA website.

Respondents who do not report any data for a given survey form in a given collection period are considered “non-respondents” for the PSRS. Automated email messages are sent out to any respondent who has not reported by the relevant submission deadline. EIA staff also contact survey non-respondents by telephone to discuss the requirement to file and any problems or questions that are delaying filing. Follow-up letters regarding the failure to file may be sent by email message to respondents who show persistent problems with non-response.

Specific schedules are followed for telephone calls and letters to non-respondents for the various PSRS surveys. Every effort is made to assist respondents in completing the survey and submitting the data in a timely manner. The response rate for weekly PSRS surveys averages above 97 percent. The response rate for monthly PSRS surveys is 99 to 100 percent.

Test Procedures

Stakeholder Outreach: The Office of Petroleum & Biofuels Statistics (PBS) undertook to seek informal comments from a diverse selection of stakeholder data users, including federal and state policy makers, industry and financial analysts, the private sector, and public. Specifically, the PBS Office Director provided briefings on the proposed changes to the program at the following events:

4/10/14 ASA Committee on Energy Statistics

11/13/14 ASA Committee on Energy Statistics

1/28-29/15 Workshop on Broadening and Modifying Collection of Petroleum and

Biofuel Supply Statistics

4/4/15 ASA Committee on Energy Statistics

6/16/15 EIA’s Annual Energy Conference

11/13/15 ASA Committee on Energy Statistics

ASA Committee on Energy Statistics: The American Statistical Association's (ASA) Committee on Energy Statistics provides technical advice to EIA at semi-annual meetings. Sessions are a combination of EIA briefings and discussions intended to solicit technical advice from the committee members, who are primarily professors, consultants, or employees of energy or survey research firms, with expertise and experience in mathematical statistics, economics, survey operations, or energy. The committee is administered by the ASA, and the members are not required to reach consensus on their advice.

Statistical Consultations

For additional information concerning this data collection, please contact Rob Merriam, at (202) 586-4615, or [email protected].

For information concerning this request for OMB approval, please contact Lawrence Stroud at (202) 586-6242, or [email protected].

File Type	application/vnd.openxmlformats-officedocument.wordprocessingml.document
File Title	PSRS Data Collection Supporting Statement, Part B
Subject	Petroleum Supply Reporting System OMB Forms Clearance Process Supporting Statement, Part B
Author	Sylvia Norris
File Modified	0000-00-00
File Created	2021-01-24

PSRS SS Part B

PSRS SS Part B.docx

Petroleum Supply Reporting System

OMB: 1905-0165

Table of Contents

B. STATISTICAL METHODS

Respondent Universe

Sampling Methodology and Estimation Procedures

Sample Design

Imputation and Estimation Procedures

Imputation Resulting from Macro Level Data Analysis

Efforts to Improve Data Accuracy

Methods to Maximize Response Rate

Test Procedures

Statistical Consultations