Frequencies for first 10,000 rows of prov2070 variable in pos2000 dataset :

       srv: |
 anesthesia |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,871       88.71       88.71
          0 |        369        3.69       92.40
          1 |        380        3.80       96.20
          2 |        333        3.33       99.53
          3 |         47        0.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017