Nothing
t_stat<-function(x,z){
nvar=dim(x)[2]
x1=x[z==1,]
x0=x[z==0,]
t=numeric(nvar)
where=numeric(nvar)
for (i in 1:nvar){
t[i]=stats::t.test(x1[,i],x0[,i])$statistic
}
t
}
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