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

       SRV: |
    CARDIAC |
CATHETERIZA |
   TION LAB |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,626       86.26       86.26
          0 |      1,256       12.56       98.82
          1 |         93        0.93       99.75
          2 |         15        0.15       99.90
          3 |         10        0.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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