clear clear matrix clear mata global datadir "d:\work\share\data" *------------------------------------------------------------------------------ clear version 12.0 set mem 1000m set maxvar 30000 pause off set more off *------------------------------------------------------------------------------ use using $datadir\w1_data.dta, clear sort mergeid merge mergeid using $datadir\w2_data.dta sort mergeid drop _merge* merge mergeid using $datadir\w3_data.dta sort mergeid drop _merge* merge mergeid using $datadir\w4_data.dta sort mergeid drop _merge* merge mergeid using $datadir\w5_data.dta sort mergeid drop _merge* sort mergeid save $datadir\w12345_data.dta, replace