1. 

   LuckyM Member

   Hello Everyone!
   
   Under the gamma distribution we have b(Ꝋ) = -log(-Ꝋ).
   Below that the core reading goes on to say the mean is E[Y] = b'(Ꝋ) = -1/Ꝋ. Are we not suppose to get 1/Ꝋ?

    

   LuckyM, Jun 28, 2017

   #1
2. 

   John Lee ActEd Tutor Staff Member

   The mean should equal \(\mu\) which you'll recall is equal to \(-1/\theta\).

    

   John Lee, Jul 4, 2017

   #2

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