Frequencies for first 10,000 rows of crdc_cthrtztn_prcdr_rooms_cnt variable in 

    Cardiac |
Catheteriza |
       tion |
  Procedure |
 Room Count |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,375       13.75       13.75
          1 |         61        0.61       14.36
          2 |         39        0.39       14.75
          3 |         22        0.22       14.97
          4 |         10        0.10       15.07
          5 |         10        0.10       15.17
          6 |          7        0.07       15.24
          7 |          2        0.02       15.26
          8 |          1        0.01       15.27
         10 |          1        0.01       15.28
          . |      8,472       84.72      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 9 Jan 2018