Frequencies for first 10,000 rows of uca_circ variable in natlterr2003 dataset :

      Other |
Circulatory |
/Respirator |
y Anomalies |
          U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          2        0.02        0.02
          2 |      9,972       99.72       99.74
          8 |         23        0.23       99.97
          9 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015