Frequencies for first 10,000 rows of prov1940 variable in pos1993 dataset :

        310 |
    routine |
  chemistry |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,797       87.97       87.97
          N |        467        4.67       92.64
          Y |        736        7.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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