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Change in How we Treat RDAS Data
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.