Frequencies for first 10,000 rows of prov1405 variable in pos1991 dataset :

technologis |
 t - 90 hrs |
 + training |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,948       99.48       99.48
          1 |         41        0.41       99.89
          2 |          4        0.04       99.93
          3 |          2        0.02       99.95
         10 |          2        0.02       99.97
         20 |          2        0.02       99.99
         30 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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