Changes to Version 2.0-22
* corrected bug in 'terms' argument in residualPlots, and other graphic
functions with a 'terms' argument
* added residual curvature tests for glm.nb
* mcPlot and mcPlot draw 'marginal/conditional' plots for lm objects. The
marginal plot is of the centered response versus a centered regressor; the
conditional plot is the corresponding added-variable plot. The plots can be
overlaid or viewed side-by-side.
* added argument marginal.scale to avPlots to scale the added-variable plot for
Y on X|Z using the scale from the marginal plot of Y vs X ignoring X. The
default is FALSE, corresponding to using scaling to maximize resolution or
use xlim and ylim to set user scaling.
* Fixed bugs in Anova.survreg() that could affect types II, II tests, both Wald
and LR, and one similar bug in linearHypothesis.survreg().
* Replaced calls to require() with requireNamespace() where possible
(suggestion of Brian Ripley).
* The following functions now produce warnings rather than errors when there
are empty groups: scatterplot(), scatterplotMatrix(),scatter3d(),
densityPlot().
* Corrected name of "Blackmoor" dataset to "Blackmore".
* Added KosteckiDillon migraines dataset (contributed by Georges Monette).
* introduced linearHypothesis.rlm() for rlm models (suggestion of Matthieu
Stigler).
* Small bug fixes/improvements.
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