Frequencies for first 10,000 rows of prov2070 variable in pos1992 dataset :

       srv: |
 anesthesia |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,851       88.51       88.51
          0 |        382        3.82       92.33
          1 |        398        3.98       96.31
          2 |        323        3.23       99.54
          3 |         46        0.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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