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The economic census is conducted on an establishment basis. A company operating at more than one location is required to file a separate report for each store, factory, shop, or other location. Each establishment is assigned a separate industry classification based on its primary activity and not that of its parent company.
The 2012 Economic Census of American Samoa, the Commonwealth of the Northern Mariana Islands, Guam, Puerto Rico, and the U.S. Virgin Islands was conducted by mail only. Descriptions of the sources of data for the island areas follow:
The report forms used to collect information for establishments in the island areas are available at the Get Forms Page.
A more detailed examination of census methodology is presented in the Methodology Page.
The classifications for all establishments are based on the North American Industry Classification System, United States, 2012 manual. The method of assigning classifications and the level of detail at which establishments are classified depends on whether or not a report form was obtained for the establishment.
All data compiled are subject to nonsampling errors. Nonsampling errors can be attributed to many sources during the development or execution of the census, such as,
The accuracy of these tabulated data is determined by the joint effects of the various nonsampling errors. Explicit measures of the effects of these nonsampling errors are not available. However, precautionary steps were taken in all phases of the collection, processing, and tabulation of the data in an effort to minimize the effects of nonsampling errors.
The Census Bureau obtains limited information from administrative records of other federal agencies, such as information on employment and payroll. This information is used in conjunction with other information available to the Census Bureau to develop estimates for missing items on the report form or for establishments for which responses were not received in time for publication.
All dollar values presented are expressed in current dollars, and are shown in thousands of dollar unless noted otherwise.
In accordance with federal law governing census reports (Title 13 of the United States Code, Section 9), no data are published that would disclose the operations of an individual establishment or business. However, the number of establishments in a kind of business or industry classification is not considered a disclosure; therefore, this information may be released. Cell values that have a potential for revealing confidential information must be suppressed or have their values perturbed by using the "Noise Infusion" technique described below. For more information on confidentiality see Disclosure.
Noise infusion is a method of disclosure avoidance in which values for each firm are perturbed prior to table creation by applying a random noise multiplier to the magnitude data (i.e., characteristics such as receipts, payroll, and number of employees) for each company. Disclosure protection is accomplished in a manner that results in a relatively small change in the vast majority of cell values.
For the 2007 and 2012 Economic Census of Island Areas, each published cell value has an associated noise flag, indicating the relative amount of distortion in the cell value resulting from the perturbation of the data for the contributors to the cell. The flag for low noise (G) indicates the cell value was changed by less than 2 percent with the application of noise, and the flag for moderate noise (H) indicates the value was changed by 2 percent or more but less than 8 percent. Cells that have been changed by 8 percent or more are suppressed from the published tables. Additionally, other cells in the table may be suppressed for additional protection from disclosure or because the quality of the data does not meet publication standards. Though some of these suppressed cells may be derived by subtraction, the results are not official and may differ substantially from the true estimate.
The number of firms in a particular tabulation cell is not considered a disclosure of confidential information about an individual establishment; therefore, this information may be released without the infusion of noise. For an introduction to the noise confidentiality protection method, see Using Noise for Disclosure Limitation of Establishment Tabular Data [PDF 105KB] by Timothy Evans, Laura Zayatz, and John Slanta in the Journal of Official Statistics (1998).
Census report forms included two types of inquiries: general inquiries and industry-specific inquiries. Data for the general inquiries, which include location, kind of business or operation, payroll, and number of employees, were available from a combination of sources for all establishments. Data for industry-specific inquiries, tailored to particular kinds of business or industries, were available only from those establishments that completed the appropriate inquiries on the report form.
For total nonresponse cases (report forms not returned) and missing items, the establishment's administrative records information was used in conjunction with industry averages, prior period data, and outside reference sources to estimate general and industry-specific inquiries. Large nonresponse cases were contacted to obtain information for general and industry-specific inquiries, as appropriate.
When reporting was incomplete or inadequate, product-line data for Puerto Rico wholesale and retail trades were expanded on the premise that data for those establishments not reporting this information are similar to product-line data for those establishments in the same kind of business that reported this information. In the 2007 Economic Census, the method used to account for nonresponse to product-line inquiries was to expand the total of reported data to represent 100 percent of the universe. Data presented for product lines were expanded in direct relationship to total sales of all establishments included in the category. A similar expansion was done using the number of establishments that reported product lines to adjust the establishment count.