Frequencies for first 10,000 rows of prov2070 variable in pos1998 dataset :

       srv: |
 anesthesia |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,805       88.05       88.05
          0 |        377        3.77       91.82
          1 |        404        4.04       95.86
          2 |        362        3.62       99.48
          3 |         52        0.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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