Frequencies for first 10,000 rows of prov1515 variable in pos1995 dataset :

technologis |
ts - 2 year |
  radiology |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,973       99.73       99.73
          1 |         16        0.16       99.89
       1.25 |          1        0.01       99.90
        1.5 |          1        0.01       99.91
          2 |          6        0.06       99.97
          3 |          1        0.01       99.98
          4 |          1        0.01       99.99
         14 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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