Frequencies for first 10,000 rows of nodiagsc variable in nhamcsed1992 dataset :

Diagnostic/ |
  screening |
 services - |
       None |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,764       87.64       87.64
          1 |      1,236       12.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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