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Alan,
You might take a look at a few of my books. In my 1989 and 1992
books, look up "variables" in the index. In my 1986 book (which is
free on my web page), the index has entries for "endogenous variables"
and "explanation and exogenous variables".
Bibliographic info for my books are listed on my web page.
cheers,
Lawrence A. Boland
http://www.sfu.ca/~boland
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