getSeeirt function

Retrieve Standard Errors of Equating From an IRT-Equating

Function to retrieve the standard errors of the IRT-equating from an object of class keout created by kequate.

getSeeirt(object)

Arguments

• object: An object of class keout as created by the function kequate.

Returns

A vector containing the standard errors of the IRT-equating.

Author(s)

bjorn.andersson@statistik.uu.se

kenny.branberg@stat.umu.se

marie.wiberg@stat.umu.se

See Also

kequate

Examples

irtmatX<-matrix(0, 4, 3)
irtmatX[,1]<-c(0.1, 0.3, 0.2, 0.5)
irtmatX[,2]<-c(0.2, 0.5, 0.4, 0.7)
irtmatX[,3]<-c(0.3, 0.7, 0.6, 0.9)
irtmatY<-matrix(0, 4, 3)
irtmatY[,1]<-c(0.15, 0.2, 0.1, 0.4)
irtmatY[,2]<-c(0.2, 0.4, 0.3, 0.6)
irtmatY[,3]<-c(0.25, 0.6, 0.5, 0.8)
irtX<-c(12, 32, 54, 22, 10)
irtY<-c(24, 36, 48, 12, 10)
xirt=0:4
glmXirt<-glm(irtX~xirt+I(xirt^2), family="poisson", x=TRUE)
glmYirt<-glm(irtY~xirt+I(xirt^2), family="poisson", x=TRUE)
keEGirt<-kequate("EG", 0:4, 0:4, glmXirt, glmYirt, irtx=irtmatX, irty=irtmatY)
getSeeirt(keEGirt)