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The National Survey on Drug Use and Health (NSDUH) concatenated 2002-2016 public-use file is available on the SAMHDA site. NSDUH is the primary source of statistical information on the use of tobacco, alcohol, prescription drugs, and illicit drugs by the U.S. civilian, noninstitutionalized population aged 12 or older. The survey also includes several series of questions that focus on mental health issues.
Users have the choice to include or exclude non-response codes using the RDAS system and send this information to the R statistical calculation server.
Previously, SAMHSA treated all missing, logically assigned, and non-response categories as missing, excluding these categories from the result set. Now, categories explicitly labeled as missing (e.g., "." in the NSDUH datasets) are excluded from the crosstab, and all other categories are included in the crosstab.
Using the recoding feature, you can define custom categories (i.e., survey response options) for variables to use in your crosstabs, thereby simplifying your results. For example, if a variable has response option categories of Yes, No, Don't Know, Refused, and Blank, you can recode the variable so Don't Know, Refused, and Blank are in one category, so your crosstab results would only display results for three categories (Yes, No, and Recoded None). The recoded category names are fully customizable.