Frequencies for first 10,000 rows of no_infec variable in natlterr2014 dataset 

         No |
 Infections |
 Reported 1 |
       True |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        205        2.05        2.05
          1 |      8,591       85.91       87.96
          9 |        127        1.27       89.23
          . |      1,077       10.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016