Frequencies for first 10,000 rows of prov1935 variable in pos1994 dataset :

        300 |
  chemistry |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,798       87.98       87.98
          N |        620        6.20       94.18
          Y |        582        5.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017