Besides independent normal errors with mean zero and constant
variance, some (many?) econometric text books do make the assumption that
the independent variables are uncorrelated. For example see
Gujarti, Damodar (1988), _Basic Econometrics 2nd edition_, McGraw Hill, p.
166
Mark Eakin
Associate Professor
Information Systems and Management Sciences Department
University of Texas at Arlington
[EMAIL PROTECTED] or
[EMAIL PROTECTED]
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