Frequencies for first 10,000 rows of crdc_cthtrztn_lab_srvc_cd variable in pos2008 dataset :

       srv: |
    cardiac |
catheteriza |
   tion lab |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,655       86.55       86.55
          0 |      1,277       12.77       99.32
          1 |         57        0.57       99.89
          2 |          6        0.06       99.95
          3 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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