Frequencies for first 10,000 rows of prov0750 variable in pos1997 dataset :

technologis |
 ts - bs/ba |
     degree |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,974       99.74       99.74
        .25 |          2        0.02       99.76
          1 |         16        0.16       99.92
          2 |          5        0.05       99.97
          3 |          2        0.02       99.99
          8 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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