Frequencies for rx_ce_lti_rxhcc66 variable in rxcoeff dataset :

Rx_CE_LTI_R |
  XHCC66 -- |
Profound or |
     Severe |
     Mental |
Retardation |
/Developmen |
tal Disabil |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          1      100.00      100.00
------------+-----------------------------------
      Total |          1      100.00

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