Frequencies for first 10,000 rows of uca_urogen variable in natlterr2006 dataset :

      Other |
 Urogenital |
  Anomalies |
        RFP |
765=f_uca_u |
    rogen U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          1        0.01        0.01
          2 |      4,783       47.83       47.84
          9 |      1,491       14.91       62.75
          . |      3,725       37.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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