Frequencies for first 10,000 rows of prov1965 variable in pos1995 dataset :

        400 |
 hematology |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,884       88.84       88.84
          N |        428        4.28       93.12
          Y |        688        6.88      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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