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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).

Keywords: ellip ; confidence ellipse ; error-variance regression ; elliptical distribution

Subject(s): Research Methods/ Statistical Methods

Issue Date: 2004

Publication Type: Journal Article

DOI and Other Identifiers: gr32_1 (Other)

PURL Identifier: http://purl.umn.edu/116245 Published in: Stata Journal, Volume 04, Number 3 Page range: 242-256

Total Pages: 15

Record appears in: Stata Journal





Autor: Alexandersson, Anders

Fuente: http://ageconsearch.umn.edu/record/116245?ln=en







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