When GENMOD applies a log link to gamma-distributed y, it is making y into natural* log of y? What is the equation behind the log transfomation?
*just found out that Log function in sas means ln (vs. Log10, which is log base 10)
No, it doesn't make Y into log(Y). It says that Y = exp(b0 + b1X) + error.
These are similar, but differ in the way that the errors are modeled. For a complete comparison, discussion, and graphs, see "Error distributions and exponential regression models."
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