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

    Was blood for total |
 cholesterol 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 |      1,351       13.51       49.43
             None found |      5,057       50.57      100.00
------------------------+-----------------------------------
                  Total |     10,000      100.00

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