Frequencies for first 10,000 rows of prov0070 variable in pos1995 dataset :

       capd |
certificati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,984       99.84       99.84
          A |         16        0.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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