Frequencies for first 10,000 rows of prov2070 variable in pos1995 dataset :

       srv: |
 anesthesia |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,933       89.33       89.33
          0 |        352        3.52       92.85
          1 |        388        3.88       96.73
          2 |        289        2.89       99.62
          3 |         38        0.38      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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