Frequencies for first 10,000 rows of ldl variable in namcs2014 dataset :

 Was blood for LDL test |
      drawn at visit or |
 within past 12 months? |      Freq.     Percent        Cum.
------------------------+-----------------------------------
                  Blank |        548        5.48        5.48
N/A, provider not asked |      2,703       27.03       32.51
                    Yes |      1,746       17.46       49.97
             None found |      5,003       50.03      100.00
------------------------+-----------------------------------
                  Total |     10,000      100.00

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