Sampling weights for the NSDUH were computed to control for unit-level and individual-level non-response, and were adjusted to ensure consistency with population estimates obtained from the U.S. Census Bureau. In order to use data from the 11 years of combined data, a new weight was created upon aggregating the 11 datasets by dividing the original weight by the number of data sets combined. Further descriptions of the sampling methods and survey techniques for the NSDUH are found elsewhere (SAMHSA, 2003, 2013).
