Graphing confidence ellipses: An update of ellip for Stata 8
Anders Alexandersson
Mississippi State University
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Abstract. This paper describes an update of the ellip command for graphing
confidence ellipses in Stata 8. Two of the most notable new features are the
option to graph confidence ellipses around variable means and the ability to
add inscribed lines. These features allow a geometric characterization of
linear regression with unequal error variances, as in McCartin (2003).
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Anders Alexandersson
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ellip, confidence ellipse, error-variance regression, elliptical distribution
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