If I want subsamples from the adult data (say ages 18 - 34) and the youth data (ages 12-17). Is it possible to merge the youth and adult data so I am able
to look at this subpopulation and if so, how do I go about dealing with the replicate weights provided for individual data sets so that my analysis is representative of the populations from where they were taken from (the youth has replicate weights: R01_Y_PWGT1 - R01_Y_PWGT100; and adults: R01_A_PWGT1 - R01_A_PWGT100). So in the merged
dataset, which do I use as the replicate weight?