Frequencies for first 10,000 rows of chol variable in namcs2011 dataset :

Was total cholesterol drawn within |
               12 months of visit? |      Freq.     Percent        Cum.
-----------------------------------+-----------------------------------
                             Blank |      1,582       15.82       15.82
Not applicable, provider not asked |        933        9.33       25.15
                               Yes |      2,131       21.31       46.46
       None found within 12 months |      5,354       53.54      100.00
-----------------------------------+-----------------------------------
                             Total |     10,000      100.00

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