Frequencies for first 10,000 rows of prov1375 variable in pos1991 dataset :

 technician |
   trainees |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,936       99.36       99.36
          1 |         31        0.31       99.67
          2 |         19        0.19       99.86
          3 |          4        0.04       99.90
          4 |          2        0.02       99.92
          5 |          3        0.03       99.95
          8 |          1        0.01       99.96
         13 |          2        0.02       99.98
         21 |          1        0.01       99.99
         30 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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