set more off
use "C:\Users\7150\Downloads\EVS1999cz.dta", clear
mean age
mean age, over(v291)
mean age [pw=weight], over(v291)
ttest age, by(v291)
ttest age, by(v291) unequal

ttest age=49
ttest age=48

mean age [pw=weight], over(v306)  
oneway age v306 [w=weight] 
oneway age v306, sidak


tab v13 v291 , col nofreq
prtest v13, by(v291)