I am not an expert in survey sampling methods, but I recommend reading the SURVEYSELECT documentation, especially the PPS methods. The procedure supports 13 standard sampling schemes. If none of them suit your needs, you can use the N=  option on the PROC SURVEYSELECT statement to specify your own stratum sample sizes by specifying values or by specifying the name of a SAS-data-set that supplies the sample sizes.  You can also use the ALLOC= option on the STRATA statement to specify values or the name of a SAS data set. The example for Dollar-Unit sampling might also be of interest: SAS/STAT(R) 13.1 User's Guide ... View more

Hi! I used the PROC MIXED-code provided in the paper Adam1 referred to, and it worked. For some reason, I never got the interactions to work out when I used the code you wrote. Odd. However, the control variables weren't crucial to my analysis as I was mainly looking for the explained variation in one of my levels. Thanks for being helpful! ... View more

Now I feel a bit stupid! How did I not consider the option to go for a wider two-sided?! Regarding the coverage probability exceeding 1-alpha, that is sort of important for this particular inference given the sensitive context the results will be used in. Thanks for walking me around the obstacle! Maybe someday there'll be a possibility to code a one-sided more easily. My gratitude, Oskar Eriksson ... View more