plot.xmean.ordinaly vs plot() in package "rms"

Would anyone be able to explain what the difference is between
plot.xmean.ordinaly and plot() in the "rms" package? (for the purposes of
testing the proportional odds assumption in ordinal models). In the package
document (https://cran.r-project.org/web/packages/rms/rms.pdf) they seem
both to be used interchangeably.

Thank you!

Kim Solve Jacobsen
PhD candidate, Wildlife Conservation Research Unit
University of Oxford
Recanati-Kaplan Centre
OX13 5QL Oxford, UK

[image: Image result for oxford logo]

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