Frequencies for first 10,000 rows of prov1515 variable in pos1999 dataset :

technologis |
ts - 2 year |
  radiology |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,965       99.65       99.65
          1 |         19        0.19       99.84
       1.25 |          1        0.01       99.85
        1.5 |          1        0.01       99.86
          2 |          7        0.07       99.93
          3 |          2        0.02       99.95
          7 |          1        0.01       99.96
          8 |          1        0.01       99.97
          9 |          2        0.02       99.99
         14 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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