Frequencies for first 10,000 rows of chmthrpy_srvc_cd variable in pos2007 dataset :

       srv: |
chemotherap |
  y service |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,682       86.82       86.82
          0 |      1,256       12.56       99.38
          1 |         53        0.53       99.91
          2 |          5        0.05       99.96
          3 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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