Frequencies for first 10,000 rows of prov1325 variable in pos1995 dataset :

 tech super |
    - histo |
  pathology |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,975       99.75       99.75
          1 |         21        0.21       99.96
          2 |          2        0.02       99.98
          3 |          1        0.01       99.99
          5 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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