Frequencies for first 10,000 rows of lab variable in namcs1998 dataset :

     is lab |
    testing |
  performed |
     in the |
    office? |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      3,895       38.95       38.95
        Yes |      6,068       60.68       99.63
      Blank |         37        0.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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