Frequencies for first 10,000 rows of prov1940 variable in pos1995 dataset :

        310 |
    routine |
  chemistry |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,884       88.84       88.84
          N |        435        4.35       93.19
          Y |        681        6.81      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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