Frequencies for first 10,000 rows of uca_nerv variable in linkpe2009psden dataset :

      Other |
    Central |
    Nervous |
     System |
Anomalies U |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |     10,000      100.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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