Frequencies for first 10,000 rows of centline variable in nhamcsed2015 dataset 

    Central |
       line |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,899       98.99       98.99
        Yes |        101        1.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017