Frequencies for first 10,000 rows of prov2070 variable in pos2006 dataset :

       srv: |
 anesthesia |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,710       87.10       87.10
          0 |        424        4.24       91.34
          1 |        397        3.97       95.31
          2 |        408        4.08       99.39
          3 |         61        0.61      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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