These software tools compute quasi-variances for estimates of a group or factor effect in a generalized linear model (including linear models, logistic regression, log linear models, hazard models, etc.) The software can be used either in conjunction with R (as contributed package qvcalc) or Xlisp-Stat on a PC, Mac or Unix computer; or remotely through the Kuvee web-based calculator.
The current, stable release of qvcalc is published on CRAN, at https://cloud.r-project.org/web/packages/qvcalc.
The development version, which may be more recent but less stable, is maintained on github at https://github.com/DavidFirth/qvcalc.
Installation in R: either
[for the stable, CRAN package]; or
[for the development version on github]
(Kuvee is new in 2013 — developed and maintained by Shaun Killingbeck. This is a client-side calculator, which offers improved facilities and performance and which replaces the server-side calculator that was previously available here.)
Documentation is vailable at two levels of detail:
- a brief description of the methodology, for users of the web-based Kuvee calculator
- a more complete manual, "Quasi-variances in Xlisp-Stat and on the Web", intended mainly for those who use the method in conjunction with Xlisp-Stat on their own computer. Cite as: Firth, D (2000), Quasi-variances in Xlisp-Stat and on the web, Journal of Statistical Software 5.4, 1-13.
The R package qvcalc comes with its own documentation.:
For use with R:
For use with Xlisp-Stat:
If you want to use the QV Calculator on your own computer in conjunction with Xlisp-Stat, the file needed is:
- qvcalc.lsp (36k)
After downloading qvcalc.lsp simply Load it into Xlisp-Stat to make available the QV Calculator.
The ship-damage example discussed in the documentation is in a separate file:
- example.lsp (8k)
Version history for the R package "qvcalc"
Please see the NEWS file (on Github).
© David Firth, 1999. This software carries ABSOLUTELY NO WARRANTY: feel free to use it, but use it at your own risk!