National Health Interview Survey Imputed Annual Family Income 1990-96 WARNING - DATA USE RESTRICTIONS Read Carefully Before Using The Public Health Service Act (Section 308) (d) provides that the data collected by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention (CDC), may be used only for the purpose of health statistical reporting and analysis. Any effort to determine the identity of any reported case is prohibited by this law. NCHS does all it can to assure that the identity of data subjects cannot be disclosed. All direct identifiers, as well as any characteristics that might lead to identification, are omitted from the dataset. Any intentional identification or disclosure of a person or establishment violates the assurances of confidentiality given to the providers of the information. Therefore, users will: 1. Use the data in these datasets for statistical reporting and analysis only. 2. Make no use of the identity of any person or establishment discovered inadvertently and advise the Director, NCHS, of any such discovery. 3. Not link these datasets with individually identifiable data from other NCHS or non-NCHS datasets By using these data, you signify your agreement to comply with the above-stated statutorily based requirement. * * * * * * * * * * * * * * * * * * * INTRODUCTION The National Health Interview Survey (NHIS) Imputed Annual Family Income 1990-96 files contain responses to the two annual family income questions from the core NHIS questionnaire with imputed values substituted for missing values and imputation flags that indicate whether each of the two annual family income variables have been imputed. There is one file for each of the seven survey years, 1990-96. The files are intended to be used in conjunction with the NHIS core and supplement files and have been constructed to enable users to link them with the NHIS files for the corresponding year. The files have ben released on CD-ROM Series 10, No. 9A. FILES AND DOCUMENTATION The seven files listed below comprise the National Health Interview Survey (NHIS) Imputed Annual Family Income 1990-96 files. The files are in a self-expanding compressed format that will uncompress to ASCII format as described below. The documentation files are in pdf format and can be viewed with Acrobat Reader software. Note: Acrobat Reader software can be downloaded from the Adobe Acrobat Reader website at: http://www.adobe.com/prodindex/acrobat/readstep.html The NHIS Imputed Annual Family Income datasets are located in: ftp://ftp.cdc.gov/pub/Health_Statistics/NCHS/Datasets/NHIS/1990-96_Family_Income The dataset documentation files are located in: ftp://ftp.cdc.gov/pub/Health_Statistics/NCHS/Dataset_Documentation/NHIS/1990-96_Family_I ncome NHIS IMPUTED ANNUAL FAMILY INCOME 1990-96 DATASETS For ease of transmission, the NHIS Imputed Annual Family Income 1990-96 datasets have been converted to a compressed format ZIP file. To load and expand the dataset, do the following: first, copy the compressed file onto your hard drive into an appropriate subdirectory. Using PKUNZIP, unzip all the files in your directory. The file FAMINC90.DAT can then be used for processing by PC statistical software packages which utilize ASCII formatted input, or uploaded to a mainframe computer for processing. Size Description File Compressed Uncompressed File name of Component layout (Kb) (bytes) FAMINC90.ZIP 1990 imputed income file ASCII 411,474 2,990,775 FAMINC91.ZIP 1991 imputed income file ASCII 412,752 3,000,800 FAMINC92.ZIP 1992 imputed income file ASCII 442,008 3,210,300 FAMINC93.ZIP 1993 imputed income file ASCII 376,913 2,741,775 FAMINC94.ZIP 1994 imputed income file ASCII 400,184 2,904,475 FAMINC95.ZIP 1995 imputed income file ASCII 354,239 2,561,675 FAMINC96.ZIP 1996 imputed income file ASCII 219,240 1,585,050 NHIS IMPUTED ANNUAL FAMILY INCOME DATASET DOCUMENTATION The dataset documentation is in pdf format. There is a file layout (also called data dictionary) for each dataset in the Layouts file. The Methods file contains information about the annual family income variables that were imputed and a description of the methods used to impute the annual family income variables. The Methods file includes tables that show the distribution of the reported and imputed values of the two annual family income variables. This file also contains a description of editing carried out on the dichotomous annual income variable prior to imputation to make the income values consistent for family members. Description File Size File name of Component layout (Kb) Pages LAYOUTS.PDF 1990-96 imputed income layout file PDF 19 14 METHODS.PDF Description of imputation method PDF 44 21 SORT ORDER OF DATASETS All of the Imputed Annual Family Income datasets have ben sorted by the Person ID. For 1990-94, the Person ID consists of the following adjacent items: processing year, processing quarter, random recode of PSU number, week-census code, segment number, household number, and person number. For 1995-96, the Person ID consists of the following adjacent items: the processing year, the household ID, and the person number. The Person ID is in file locations 5-18. MERGING IMPUTED ANNUAL FAMILY INCOME FILES WITH OTHER NHIS FILES To merge an Imputed Annual Family Income file into any of the person-level NHIS files, merge by the Person ID. For 1990-94, the Person ID consists of the following adjacent items: processing year, processing quarter, random recode of PSU number, week-census code, segment number, household number, and person number. For the 1995-96, the Person ID consists of the following adjacent items: the processing year, the household ID, and the person number. The Person ID is in file locations 5-18 of the Imputed Annual Family Income 1990-96 files and file locations 3-16 of the NHIS person-level files. CONTACT INFORMATION For more information on this or other CD-ROM products available from the National Center for Health Statistics, contact: Data Dissemination Branch National Center for Health Statistics Centers for Disease Control and Prevention 6525 Belcrest Road, Room 1064 Hyattsville, Maryland 20782-2003 Telephone: (301) 458-4636 (458-INFO) FAX: (301) 458-4025 Internet e-mail address: SETS@cdc.gov Internet home page address: www.cdc.gov/nchs STATEMENT OF AUTHENTICITY This material has been cleared for public distribution by CDC/ATSDR and will be authentic if obtained directly from ftp.cdc.gov. CDC/ATSDR takes all effort to assure the authenticity of electronically distributed documents. However, in all instances where the electronic and official agency record differ, the authenticity of the official agency record is controlling.