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 qvcalc package in R
The current, stable release of qvcalc is published on CRAN, at https://cloud.r-project.org/package=qvcalc.
Installation in R:
Web-based calculator 'Kuvee'
Kuvee was 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 available in various forms. The currently maintained dosumentation sources are:
- Standardized documentation for the qvcalc package in R (including some references to the research literature too)
- a brief description of the methodology, for users of the web-based Kuvee calculator
In addition, there is a more complete (but older) 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.
For use with R:
The R package qvcalc is available at CRAN. See above for installation in R.
For use with Xlisp-Stat:
[Note: The Xlisp-Stat implementation is no longer supported in any way.]
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 page.
© David Firth, 1999-2019. This software carries ABSOLUTELY NO WARRANTY: feel free to use it, but use it at your own risk!