Frequencies for first 10,000 rows of prov2070 variable in pos2004 dataset :

       srv: |
 anesthesia |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,766       87.66       87.66
          0 |        412        4.12       91.78
          1 |        384        3.84       95.62
          2 |        381        3.81       99.43
          3 |         57        0.57      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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