Frequencies for first 10,000 rows of prov2070 variable in pos2008 dataset :

       srv: |
 anesthesia |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,655       86.55       86.55
          0 |        449        4.49       91.04
          1 |        398        3.98       95.02
          2 |        431        4.31       99.33
          3 |         67        0.67      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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