On 18/07/13 02:36, Chris89 wrote:
Dear users,
I want to compute r-squared values from a glm regression using a gamma
distribution and an "identity" link-function, but find no such thing when
using the summary() or names() function. My next guess was to calculate it
by "hand", i.e.
r2 = (sum((estimate - xbar)^2) /sum((x-xbar)^2))
but I am unsure if this is even allowed...
Who is going to disallow you? It's a free country. (I refer to Norway of
course; freer than most countries, in my understanding.)
But since you are maximizing a likelihood based on the Gamma distribution,
rather than doing least squares, what exactly is the relevance of R-squared
anyway?
cheers,
Rolf Turner
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