Frequencies for first 10,000 rows of prov1950 variable in pos1991 dataset :

330   other |
  chemistry |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,536       85.36       85.36
          N |        530        5.30       90.66
          Y |        934        9.34      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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