qrfactor 1.6

New features

qrfactor() gains a rotation argument (default FALSE). Set rotation = TRUE (or "varimax") to varimax-rotate the retained factors to simple structure; the default keeps the classical unrotated solution, so existing results are unchanged. When rotation is requested the same orthogonal rotation is applied to the R-mode and Q-mode loadings, so both modes remain on one common set of axes and the scores, combined loadings, appended index columns and all biplots/maps rotate consistently. The eigenvectors, eigenvalues and PCA loadings are left unrotated. The fitted object now also carries rotation, unrotated.r.loading and unrotated.q.loading.

The plot() method no longer leaves the user’s graphics state changed: par() is captured on entry and restored with on.exit().
The analysis views (type = "cluster", "anova", "region", "admin", "diagnose") no longer write statistical tables to the console unconditionally. They are silent by default and print only when the new plot(..., verbose = TRUE) argument is set; the print()/summary() methods are unaffected.
Quoted software and package names ('qrfactor()', 'plot()', 'ESRI') in the DESCRIPTION, and rewrote the ?qrfactor examples so the fast data-frame workflow runs unwrapped and only the shapefile / map examples (which need sf/sp) are under \donttest{}. The stale readOGR() example call was removed.

Restoration release. qrfactor was archived from CRAN in 2018; this version repairs it for current R and CRAN.

Registered the S3 methods (qrfactor.default, print.qrfactor, summary.qrfactor, plot.qrfactor) in NAMESPACE. The archived version exported them with exportPattern(".") but never registered them, so qrfactor() failed with no applicable method for 'qrfactor' applied to an object of class "data.frame". This was the cause of the CRAN archival.
Fixed a crash under R >= 4.2 in the map plots, where a condition of length greater than one is now an error rather than a silent first-element take.

Replaced retired spatial packages. Shapefiles are now read with sf::st_read() instead of rgdal::readOGR(), and the maptools and mgraph dependencies were removed. A small compatibility layer bridges the sf/sp object differences.
Depends: on contributed packages moved to Imports:; base-R functions are now explicitly imported via importFrom().