NEWS.md

In KRLS: Kernel-Based Regularized Least Squares

KRLS 1.1-0

Bug fixes

• lambdasearch() now returns a plain scalar instead of a 1x1 matrix (it previously used ifelse() which inherits the shape of its test argument). This eliminates the R 4.4+ deprecation warning "Recycling array of length 1 in vector-array arithmetic is deprecated" that fired during Eigenobject$values + lambda in both solveforc() and krls()'s vcov calculation. The numerical results are identical to 1.0-0 within rounding.

• plot.krls() no longer dispatches UseMethod("summary") on a wrong- class input — that was a copy-paste mistake. All three S3 methods (predict, summary, plot) now stop() cleanly when the input is not a krls object, with a clear message. The class check itself is now inherits(x, "krls") rather than class(x) != "krls" (the old pattern misbehaves when the object has multiple classes).

Internal cleanups (no user-visible change)

• krls(): removed dead code — pre-allocation of Eigenobject$values and $vectors immediately overwritten by eigen(), and several large commented-out alternative implementations.
• solveforc(): trimmed dead alternatives, modernized formatting.
• predict.krls(): removed dead commented if(is.vector(newdata)) branch; fixed typo "standart errors" -> "standard errors".
• Redundant sd(y) == 0 check in krls() removed (var(y) == 0 already covers it).

DESCRIPTION

• Switched to Authors@R (Jens Hainmueller as cre+aut, Chad Hazlett as aut) per current CRAN style.
• Imports: grDevices, graphics, stats added explicitly (these were already used via the NAMESPACE; making the dependency declaration explicit).
• Suggests: testthat (>= 3.0.0) added; Config/testthat/edition: 3 added.
• URL field gains the GitHub repo and corrects the Stanford URL. BugReports field added.
• Encoding: UTF-8 declared explicitly.
• Description text adds a DOI to the 2014 Political Analysis paper.

KRLS documentation built on April 30, 2026, 9:08 a.m.