Frequencies for first 10,000 rows of prov2070 variable in pos2001 dataset :

       srv: |
 anesthesia |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,837       88.37       88.37
          0 |        380        3.80       92.17
          1 |        375        3.75       95.92
          2 |        358        3.58       99.50
          3 |         50        0.50      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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