Frequencies for first 10,000 rows of chmthrpy_srvc_cd variable in pos2011 dataset :

   Services |
  Provided: |
Chemotherap |
          y |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,614       86.14       86.14
          0 |      1,219       12.19       98.33
          1 |        144        1.44       99.77
          2 |         11        0.11       99.88
          3 |         12        0.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Apr 2019