Frequencies for first 10,000 rows of prov1965 variable in pos1993 dataset :

        400 |
 hematology |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,797       87.97       87.97
          N |        453        4.53       92.50
          Y |        750        7.50      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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