Frequencies for first 10,000 rows of prov2070 variable in pos1991 dataset :

       srv: |
 anesthesia |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,770       87.70       87.70
          0 |        509        5.09       92.79
          1 |        389        3.89       96.68
          2 |        296        2.96       99.64
          3 |         36        0.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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