sysuse auto, clear
adopath++ ../

bssize initial, tau(0.01) pdb(5)



set seed 1
bootstrap "regress mpg foreign displacement" _b, reps(1326) saving(one) replace
bssize refine using one

bootstrap "regress mpg foreign displacement" _b, reps(128) saving(two) replace
use one, clear
append using two
bstat

clear
bssize analyze using one, append(two) pdb(2.5)