Frequencies for first 10,000 rows of hdl variable in namcs2012 dataset :

 Was blood for HDL test |
      drawn at visit or |
 within past 12 months? |      Freq.     Percent        Cum.
------------------------+-----------------------------------
                  Blank |        690        6.90        6.90
N/A, provider not asked |      2,900       29.00       35.90
                    Yes |      1,343       13.43       49.33
             None found |      5,067       50.67      100.00
------------------------+-----------------------------------
                  Total |     10,000      100.00

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