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Restriktor is a free, open source R package for linear equality and inequality constrained statistical estimation, inference and evaluation for linear models.
Restriktor is implemented as an R package. This means that before installing restriktor, you should have installed a recent version (>= 4.0.0) of R. You can download the latest version of R from the R-project website.
R is a command line driven program. This means that it does not have a graphical user interface (GUI). Luckily, there are many good GUI’s to make life easier, for example Rstudio, R Commander and RKWard.
Once you have installed R, the next step is to install restriktor. This can be done by typing in R:
install.packages("restriktor", dependencies = TRUE)
To check if the installation was successful, you can load the restriktor package and try for example:
library(restriktor)
# construct constraint syntax based on the factor level names
constraints <- 'GroupActive < GroupPassive < GroupControl < GroupNo'Fit the unrestricted linear model, where “Age” is the response
variable and "Group" a factor with four treatment
groups.
fit.ANOVA <- lm(Age ~ -1 + Group, data = ZelazoKolb1972)
# fit the restricted model
restr.ANOVA <- restriktor(fit.ANOVA, constraints = constraints)
# summary of the restricted parameter estimates
summary(restr.ANOVA)
# informative hypothesis tests
iht(restr.ANOVA)
# Generalized Order-Restricted Information Criterion (GORIC)
goric(restr.ANOVA, comparison = "complement")If you can see the output, everything is set up and ready.
For more information see the restriktor website.
These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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