Frequencies for first 10,000 rows of lab variable in namcs1997 dataset :

     is lab |
    testing |
  performed |
     in the |
    office? |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      5,215       52.15       52.15
        Yes |      4,570       45.70       97.85
      Blank |        215        2.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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