Since the release of the previous version of the 2011 Public Use Data File and Codebook a number of variables have been added. Some of the additional variables are revised versions of previous variables and replace the ones removed from the data file.
A model to predict adult mental illness was revised in the 2012 NSDUH to produce more accurate estimates. The mental illness variables included in the 2011 NSDUH data files are based on the revised 2012 model.
One new geographic variable(PDEN00), has been added to the data file to replace the previous PDEN variable. In this case, the only difference is the variable name. The variable has been renamed to indicate which census data was used in its construction.
Due to unequal selection probabilities at multiple stages of sample selection and various adjustments, such as those for nonresponse and post-stratification, the 2011 NSDUH sample design is not self-weighting. Analysts are advised to use the final sample weight when attempting to use the 2011 NSDUH data to draw inferences about the target population or any subdomains of the target population. All estimates published in SAMHSA reports (such as the results from the 2011 NSDUH) are weighted using the final analysis weight for the full sample (ANALWT). For the public use file, the corresponding final sample weight is denoted as ANALWT_C, with the "C" denoting confidentiality protection. This sample weight represents the total number of target population persons each record on the file represents. Note that the sum of ANALWT_C, over all records on the data file, represents an estimate of the total number of people in the target population.
In the 2008 NSDUH's mental health module, the adult sample was split into a sample A who received the WHODAS questions LIREMEM through LIAD68 and a sample B who received the SDS questions MHAD66a through MHAD68. In the 2011 NSDUH, however, all of the adults in the sample received the WHODAS questions. Therefore, there is no need to have a separate adult mental health weight beginning in the 2009 NSDUH because the person-level analysis weight can be used to produce the adult mental health estimates.
ICPSR data undergo a confidentiality review and are altered when necessary to limit the risk of disclosure. ICPSR also routinely creates ready-to-go data files along with setups in the major statistical software formats as well as standard codebooks to accompany the data. In addition to these procedures, ICPSR performed the following processing steps for this data collection:
Terms of use are available at http://www.icpsr.umich.edu/icpsrweb/ICPSR/studies/34481/terms
AVAILABLE. This study is freely available to the general public.