I can do this for difference in weighted frequencies by making the previous month's employment variable negative (-1) and the current month's employment variable positive (+1), which produces the net sample-to-sample change in the variable "employed", as well as the CV. But I don't know how to do it for ratios (for example the total rate of employment).
data output.newcombined ;
set output.combined;
if employed=1;
if sampledate in (previousmonth) then changeemployed= -1;
if sampledate in (currentmonth) then changeemployed= 1;
run;
proc surveymeans data=output.newcombined varmethod=brr clm nobs mean median CV cvwt SUMWGT Sum CVSum CLSum alpha=0.32;
var changeemployed;
weight finalwt ;
repweights bw1-bw1000 ;
run ;