Frequencies for first 10,000 rows of prov0750 variable in pos1991 dataset :

technologis |
 ts - bs/ba |
     degree |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,981       99.81       99.81
          1 |          9        0.09       99.90
          2 |          6        0.06       99.96
          3 |          1        0.01       99.97
          8 |          1        0.01       99.98
          9 |          1        0.01       99.99
         12 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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