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- May 5th 2010, 05:17 PM #1

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## How did they get this?

My textbook makes a calculation and just says "with some simplications", and then gets the answer.

We have L0=(1/sqrt(2pi))^n*(e^(-1/2*sum(xi-m0)^2)...i.e. this the max likelihood function for a normal with variance 1 and mean m0. Sum is from 1 to n. We have L1 is the same except replace m0 with m1.

Then they compute L0/L1 and get

e^((n/2)*(m1^2-m0^2)+(m0-m1)*sum(xi))

I do not see where this step comes from. Any ideas?

Thank you.

- May 5th 2010, 07:27 PM #2

- May 6th 2010, 03:57 AM #3

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Just how they get that form of Lo/L1...I understand the analysis that follows using the Neyman Pearson lemma, but I just don't understand this, and maybe it's an algebraic thing I'm missing, but I don't see how they are getting the e^((n/2)*(m1^2-m0^2)+(m0-m1)*sum(xi)) from the two likelihood functions.....Maybe there is some property of sums I am missing, but I am not sure.

- May 6th 2010, 08:25 AM #4