clear
#delimit;

global years  "89 90 91 92 93 94 95 96 97 98 99 00 01 02 03 04 05 06";
global years  "00 01 02 03 04 05 06";
global months "01 02 03 04 05 06 07 08 09 10 11 12";
/*
foreach year  of global years{;
foreach month of global months{;
global file="`year'`month'";
                              !gunzip -f ~/data/cps/monthly/datafiles/cpsb$file.dta;

                               if `year'>=89 & `year'<=93{;
                              use ~/data/cps/monthly/datafiles/cpsb$file.dta;
                              keep if a_lfsr==3|a_lfsr==4;
                              save /Sastemp/cpsbu$file, replace;
                                                                 };

                               if `year'>=94|`year'<=6{;
                              use ~/data/cps/monthly/datafiles/cpsb$file.dta;
                              keep if pemlr==3|pemlr==4;                                             
                              save /Sastemp/cpsbu$file, replace;
                                                                 };
                            };
                            };
exit;
                              set obs 1;
                              gen a=.;

global years "89 90 91 92 93";
foreach year  of global years{;
foreach month of global months{;
global file="`year'`month'";
                               append using /Sastemp/cpsbu$file;
                            };
                            };
save /Sastemp/cpsbui_pool_89_93, replace;
ex;

set obs 1;
gen a=.;

global years  "94 95 96 97 98 99 00 01 02 03 04 05 06";  
foreach year  of global years{;
foreach month of global months{;
global file="`year'`month'";
                               append using /Sastemp/cpsbu$file;
                            };
                            };
save /Sastemp/cpsbui_pool_94_06, replace;
            };            
*/