/*** generating random variables***/
set seed 19560713
set obs 1000
gen my= invnorm(uniform())
gen rx=uniform()
gen lx=uniform()

/***Summary statistics***/
sum my rx lx

/***Graph***/
histogram my
histogram rx
histogram lx
 
/***Random Walk ***/
gen rpos=rx+rx[_n-1]
gen lpos=lx+lx[_n-1]
line rpos lpos