Frequencies for first 10,000 rows of lab variable in namcs2008 dataset :

is lab testing |
  performed at |
       office? |      Freq.     Percent        Cum.
---------------+-----------------------------------
       unknown |         14        0.14        0.14
           yes |      6,796       67.96       68.10
            no |      3,190       31.90      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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