Frequencies for first 10,000 rows of prov1255 variable in pos1991 dataset :

technicians |
-high sch + |
 experience |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,926       99.26       99.26
          1 |         39        0.39       99.65
          2 |         18        0.18       99.83
          3 |          4        0.04       99.87
          4 |          4        0.04       99.91
          5 |          4        0.04       99.95
          6 |          2        0.02       99.97
          7 |          1        0.01       99.98
         29 |          1        0.01       99.99
         31 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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