Frequencies for first 10,000 rows of prov1515 variable in pos1991 dataset :

technologis |
ts - 2 year |
  radiology |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,910       99.10       99.10
          1 |         56        0.56       99.66
       1.25 |          1        0.01       99.67
        1.5 |          2        0.02       99.69
          2 |         19        0.19       99.88
          3 |          4        0.04       99.92
          4 |          2        0.02       99.94
          6 |          1        0.01       99.95
          7 |          2        0.02       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