Frequencies for first 10,000 rows of prov2070 variable in pos1994 dataset :

       srv: |
 anesthesia |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,940       89.40       89.40
          0 |        350        3.50       92.90
          1 |        382        3.82       96.72
          2 |        288        2.88       99.60
          3 |         40        0.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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