Frequencies for first 10,000 rows of prov2070 variable in pos1999 dataset :

       srv: |
 anesthesia |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,885       88.85       88.85
          0 |        366        3.66       92.51
          1 |        373        3.73       96.24
          2 |        333        3.33       99.57
          3 |         43        0.43      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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