Frequencies for first 10,000 rows of prov1955 variable in pos1991 dataset :

       330d |
endocrinolo |
         gy |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,536       85.36       85.36
          N |      1,284       12.84       98.20
          Y |        180        1.80      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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