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

       srv: |
    cardiac |
catheteriza |
   tion lab |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,682       86.82       86.82
          0 |      1,271       12.71       99.53
          1 |         39        0.39       99.92
          2 |          5        0.05       99.97
          3 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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