Frequencies for first 10,000 rows of ldl variable in namcs2013 dataset :

 Was blood for LDL test |
      drawn at visit or |
 within past 12 months? |      Freq.     Percent        Cum.
------------------------+-----------------------------------
                  Blank |        662        6.62        6.62
N/A, provider not asked |      2,741       27.41       34.03
                    Yes |      1,600       16.00       50.03
             None found |      4,997       49.97      100.00
------------------------+-----------------------------------
                  Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017