Frequencies for first 10,000 rows of prov1330 variable in pos1993 dataset :

 tech super |
          - |
 hematology |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,763       97.63       97.63
          1 |        188        1.88       99.51
          2 |         38        0.38       99.89
          3 |          6        0.06       99.95
          4 |          3        0.03       99.98
          5 |          1        0.01       99.99
        100 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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