STeve: you are right. I did talk with my statistician in my institution. She also suggested using Surveyreg. Its very hard to use non-parametric tests in complex survey data. ... View more

HI Xia, let me clearify further. i am creating 2 samples. And I am trying to compare the difference in mean age between these 2 samples. i found out that distribution of age is not nominla( as per the histogram from UNIVARIATE). So ttest doesnt work. I think Npar1way Wilcoxon will work. But I am not sure how to use it since the data is a complex survey data with strata, cluster and weights. So should we incorporate them as other commands like Surveyfreq, surveylogistic or surveyreg (but it npar1way doesnt allow that though) or just do ignoring the complxities of the data? ... View more

Thanks Reeza. I will try to do that! ... View more

Actually, I want to compare means of 2 continuous variables(non-parametric) across 2 groups in a complex survey data. I don't know which test to use. ... View more