Frequencies for first 10,000 rows of prov2125 variable in pos1991 dataset :

       srv: |
 diagnostic |
      x-ray |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,084       70.84       70.84
          0 |        200        2.00       72.84
          1 |        608        6.08       78.92
          2 |         91        0.91       79.83
          3 |        320        3.20       83.03
          4 |         76        0.76       83.79
          5 |      1,390       13.90       97.69
          6 |          9        0.09       97.78
          7 |        222        2.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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