Frequencies for first 10,000 rows of prov5990 variable in posclia2006 dataset :

 laboratory |
classificat |
      ion 4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      4,271       42.71       42.71
         00 |      5,729       57.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016