Frequencies for first 10,000 rows of prov4990 variable in posclia1997 dataset :

   prov4990 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,748       97.48       97.48
          Y |        252        2.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016