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

 Was blood for LDL test |
      drawn at visit or |
 within past 12 months? |      Freq.     Percent        Cum.
------------------------+-----------------------------------
                  Blank |        692        6.92        6.92
N/A, provider not asked |      2,900       29.00       35.92
                    Yes |      1,323       13.23       49.15
             None found |      5,085       50.85      100.00
------------------------+-----------------------------------
                  Total |     10,000      100.00

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