Frequencies for first 10,000 rows of crdc_cthtrztn_lab_srvc_cd variable in pos2009 dataset :

       SRV: |
    CARDIAC |
CATHETERIZA |
   TION LAB |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,638       86.38       86.38
          0 |      1,266       12.66       99.04
          1 |         77        0.77       99.81
          2 |         12        0.12       99.93
          3 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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