Sorry to say this but I have just discovered that offset no longer
works _at all_ since 62.3. (Very embarrassing to discover this in
front of students - I rarely use glm myself as my functions generally
run much faster and are more flexible.) In 62.2, it worked. According
to diff, there is no difference between the two versions of family.R,
but there are a lot in models.R. However, grep shows none involving
offset.  Jim
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