Frequencies for first 10,000 rows of prov0070 variable in pos1993 dataset :

       capd |
certificati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,985       99.85       99.85
          A |         11        0.11       99.96
          B |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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