Frequencies for first 10,000 rows of prov2105 variable in pos1991 dataset :

       srv: |
   clinical |
       labs |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,084       70.84       70.84
          0 |        180        1.80       72.64
          1 |        626        6.26       78.90
          2 |         95        0.95       79.85
          3 |        301        3.01       82.86
          4 |         74        0.74       83.60
          5 |      1,420       14.20       97.80
          6 |          5        0.05       97.85
          7 |        215        2.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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