Frequencies for first 10,000 rows of prov1370 variable in pos1991 dataset :

 tech super |
          - |
radiobioass |
         ay |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,969       99.69       99.69
          1 |         30        0.30       99.99
          2 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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