Frequencies for first 10,000 rows of prov2070 variable in pos1993 dataset :

       srv: |
 anesthesia |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,856       88.56       88.56
          0 |        364        3.64       92.20
          1 |        401        4.01       96.21
          2 |        335        3.35       99.56
          3 |         44        0.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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