Frequencies for first 10,000 rows of prov1940 variable in pos1991 dataset :

        310 |
    routine |
  chemistry |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,536       85.36       85.36
          N |        546        5.46       90.82
          Y |        918        9.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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