Frequencies for first 10,000 rows of uca_urogen variable in natl2005 dataset :

      Other |
 Urogenital |
Anomalies U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          9        0.09        0.09
          2 |      9,851       98.51       98.60
          9 |        140        1.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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