Frequencies for first 10,000 rows of chmthrpy_srvc_cd variable in pos2010 dataset :

       SRV: |
CHEMOTHERAP |
  Y SERVICE |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,626       86.26       86.26
          0 |      1,233       12.33       98.59
          1 |        119        1.19       99.78
          2 |         13        0.13       99.91
          3 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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