Frequencies for first 10,000 rows of lab variable in namcs2002 dataset :

     Is lab |
    testing |
  performed |
 at office? |      Freq.     Percent        Cum.
------------+-----------------------------------
        Yes |      4,565       45.65       45.65
         No |      5,435       54.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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