STARJAS: Stata module to produce Arjas plot to check proportional hazards assumption

Enzo Coviello ()
Additional contact information
Enzo Coviello: Dipartimento di Prevenzione Az. USL Ba/1

Statistical Software Components from Boston College Department of Economics

Abstract: Arjas plots allow to check if a categorical covariate should be included in a proportional hazards model and if this covariate has proportional hazards. For each level a line is plotted. If the covariate does not need to be in the model then for each value a roughly 45° line through origin should be plotted. Otherwise Arjas plots will give curves which are approximately linear but with slope differing from 1. If a covariate has a nonproportional effect on the hazard rate then the curves will differ nonlinearly from 45° line. Assume an indicator variable having only two values 0 and 1, the curve for the level 1 should be concave if the hazard ratio is increasing in t whereas the curve for the level 0 should be convex.

Language: Stata
Requires: Stata version 8.0
Keywords: proportional hazards; Arjas plot (search for similar items in EconPapers)
Date: 2007-02-10
Note: This module may be installed from within Stata by typing "ssc install starjas". Windows users should not attempt to download these files with a web browser.

Downloads: (external link)
http://fmwww.bc.edu/repec/bocode/s/starjas.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/s/starjas.hlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/a/arjas_example.ado example program (text/plain)
http://fmwww.bc.edu/repec/bocode/b/BMT.dta sample data file (application/x-stata)
http://fmwww.bc.edu/repec/bocode/s/starjas.pdf presentation slides (application/pdf)

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