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Usage:
plotresids(type,plots[plot options]) type one of "raw","scaled",
"standardized", or "studentized", plots one or more of "yhat",
"rankits","index".
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Keywords:
Residual graphs
plotresids does residual plots with an alternate front end from
that provided by resvsrankits, resvsyhat, resvsindex.
There are two required arguments. The first is the residual type
as a character scalar and can be one of "raw", "scaled",
"standardized", or "studentized". Scaled residuals have been divided
by the root MSE, standardized are divided by ((1-HII)MSE)^.5, and
studentized are outlier-t style.
The second argument is a character scalar or vector that tells which
plots to make. The components can be one or more of "yhat",
"rankits", or "index" for plotting versus fitted values, normal scores,
or case numbers. Finally, you can add plotting keywords.
Gary Oehlert
2005-08-12