Frequencies for first 10,000 rows of prov2070 variable in pos2003 dataset :

       srv: |
 anesthesia |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,789       87.89       87.89
          0 |        397        3.97       91.86
          1 |        377        3.77       95.63
          2 |        377        3.77       99.40
          3 |         60        0.60      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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