Frequencies for rx_ce_lti_rxhcc67 variable in rxcoeff dataset :

 rx_ce_lti_ |
-- moderate |
     mental |
retardation |
/developmen |
        tal |
 disability |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          1      100.00      100.00
------------+-----------------------------------
      Total |          1      100.00

by Jean Roth , jroth@nber.org , 2 May 2016