Errata for 1979-2016 Data Release

National Longitudinal Survey of Youth - 1979 Cohort

Errata for 1979-2016 Data Release

Newest Errata [both posted 4/9/2019]

Data for Respondent Interviewed under Wrong CASEID in 2006 Removed

It was recently discovered that limited data for a respondent interviewed under caseid #4646 in 2006 inadvertently remained in previous public data releases. These data have been removed for survey year 2006 (round 22) and for a small number of created variables. The sampling weights and Reason for Non-interview variables for 2006 have also been adjusted. There should be little to essentially no effect on weights for remaining respondents. The correct number of non-interviews for the 2006 survey has increased by 1 to 5033. In addition, changes have been made where necessary to the Work History arrays (STATUS, HOURS and DUAL JOB arrays), Recipiency month data and Employers_all roster items. The number of interviews for 2006 have decreased by 1 to 7653 (decreasing the number of completed interviews to 7653).

Adjustments made to data for respondent #4646 fall into several categories:

  • All data for this respondent has been eliminated for survey year 2006 with the exception of SAMPWEIGHT, C_SAMPWEIGHT and RNI. These values have been corrected to reflect a 2006 non-interview status. In addition, certain variables in the XRND survey year category that pertain to 2006 have been deleted as well.
  • Some values have been changed to eliminate the cumulative presence of data erroneously collected for #4646, including some variables in 2016.
  • Variables in relevant data arrays/rosters has been adjusted where necessary to eliminate erroneous data and incorporate retrospective data provided by the correct respondent in 2016. These arrays include the Work History arrays, Recipiency month variables and the Employers_all roster.

The corrections discussed above are reflected in the current public data release. Users can contact User Services for further information.

The correct respondent #4646 was located for the 2016 interview and provided some retrospective data. 

Missing Values in Question Loops Added to Current Release

Some values for assets collected in repetitive question loops were inadvertently omitted in past releases for survey years 1998-2014. These question loops contained values that did not require topcoding. Asset values reported in repetitive question loops can be identified by the following characteristics:

  • They are assigned to area of interest ASSETS;
  • Question names have a number extension (e.g. .01, .02, etc.);
  • For documentation consistency, question names contain the string “TRUNC”, whether or not they are truncated/topcoded.

Variables containing topcoded values include the string “TRUNC” or “TRUNCATED” in the variable title. Un-topcoded values from loops that were added to the current release do not include those strings in the variable title. Asset values from all repetitive question loops are included in the current public release data.

Uncorrectable Data Errors

Legal Form of Business Not Collected for 31 Cases in 2012 (posted 1/23/2015)

Due to an error in the questionnaire, the legal form of a business (SES-BUSOWN-12.#) for 31 NLSY79 respondents was not collected in 2012. This error affects the respondents who reported a business in 2012 that matches a job reported during the last interview and who were last interviewed in 2008 and prior. The legal form of a business for these 31 cases should be coded as -3.

The IDs for these 31 respondents can be found in the following file: legalform12_invalidmissing.xlsx.

Since in 2012 we did not re-ask the legal form of a business that matched a job reported in the last interview, users wishing to determine the legal form of that business should use the employer number from the previous survey year variable in 2012 (EMPLOYER_EMPPREVID.#). For example, if EMPLOYER_EMPPREVID.# is 1, which means that the business is the same as job #1 in 2010, then legal form of that business in 2012 is the value of SES-BUSOWN-12.01 or BUSOWN-12.01 in 2010. If the business in 2012 is job #2 in 2010, then the legal form of that business is the value of SES-BUSOWN-12.02 or BUSOWN-12.02 in 2010.

Missing Occupation, Industry and Class of Worker in 1994 data items

The occupation, industry and class of worker information for 353 CPS employers were not collected during the 1994 interview. These CPS employers were either less than 9 weeks in duration since the last interview, or were employers for whom the respondent worked less than 10 hours per week. They were erroneously treated as other non-CPS employers with those characteristics, for which occupation, industry and class of worker information is not collected. For those employers that were also reported in the previous survey year, and for which the respondent confirmed that his/her occupation did not change since the previous survey year, the occupation, industry and class of worker codes from the previous survey year should also apply. Users may also data subsequent survey years in a similar manner to attempt to fill in more of this information.

This error is present on all current NLSY79 data releases.

Missing information on Union Affiliation/Collective Bargaining in 1994 data items

Due to an error in the questionnaire, information on union affiliation and collective bargaining on a number of employers was not collected. Respondents reporting a non-self-employed job should have answered these questions. This error affects employer #1 (generally the CPS employer) for 3,210 respondents of the 7141 respondents who should have been asked, employer #2 for 531 of the 2215 respondents who should have been asked, employer #3 for 128 of the 606 who should have been asked, employer #4 for 34 of 168 who should have been asked and employer #5 for 6 of 48 who should have been asked. This is 45% missing for employer #1, 24% missing for employer #2, 21% missing for employer #3, 20% missing for employer #4 and 13% missing for employer #5.

Conversely, information on union affiliation and collective bargaining was collected on a number of self-employed respondents, for whom these questions should not have been asked. This error affects employer #1 for 166 cases, employer #2 for 45 cases, and employers #3, #4 and #5 for 1 case each. This information for self-employed respondents (those with a code of "4" for class of worker) should be disregarded.

This error is present on all current NLSY79 data releases.

2 missing cases in 1994 data items

Due to probable machine glitches, the data from two (2) apparently completed interviews was rendered inaccessible. 1994 variables for cases #5078 and #10524 are missing. Any 1994 data items remaining for these cases is meaningless and should be discarded for purposes of analysis. The 1996 interview period for these cases spanned from the 1993 to the 1996 interview. Information that would have been collected at the 1994 interview is thus now included in the data for the 1996 survey year.

This data error is present on all current NLSY79 data releases.

NORC 1978 Memo

The 1978 NORC memo regarding race and ethnicity coding can be found here: NORC 1978 memo