[R] distributions and glm

[drbn]

Hello,
I have seen that some papers do this:

1.) Group data by year (e.g. 35 years) 

2.) Estimate the mean of the key variable through the distribution that fits
better (some years is a normal distribution , others is a more skewed, gamma
distribution, etc.)

3.) With these estimated means of each year do a GLM.

I'd like to know if it is possible (to use these means in a GLM) or is a
wrong idea.

Thanks in advance

David
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