Frequencies for first 10,000 rows of prov0750 variable in pos1996 dataset :

technologis |
 ts - bs/ba |
     degree |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,976       99.76       99.76
        .25 |          2        0.02       99.78
          1 |         15        0.15       99.93
          2 |          5        0.05       99.98
          3 |          1        0.01       99.99
          8 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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