Frequencies for rx_ce_lti_rxhcc71 variable in rxcoeff dataset :

Rx_CE_LTI_R |
  XHCC71 -- |
 Myasthenia |
    Gravis, |
Amyotrophic |
    Lateral |
  Sclerosis |
 and Other  |      Freq.     Percent        Cum.
------------+-----------------------------------
       .052 |          1      100.00      100.00
------------+-----------------------------------
      Total |          1      100.00

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