[R] glm: family=exponential() or family=Gamma(alpha=1)?

[Michael Wang]

In glm, is there a way to specify the family
to be exponential, or Gamma but with alpha=1?

This is required by Dobson Exercise 4.3d, page 48.
But without specifying alpha=1, the asnwer is the same
as in the book.

If reply to the list, please cc me a copy. 

Thanks.
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