Frequencies for first 10,000 rows of prov2070 variable in pos2007 dataset :

       srv: |
 anesthesia |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,682       86.82       86.82
          0 |        435        4.35       91.17
          1 |        396        3.96       95.13
          2 |        422        4.22       99.35
          3 |         65        0.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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