Frequencies for first 10,000 rows of diagscrn variable in nhamcsed2009 dataset :

       were |
 diagnostic |
   services |
 ordered or |
  provided? |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,090       30.90       30.90
          1 |      6,695       66.95       97.85
          2 |        215        2.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016