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R/p4pl.R
In irtProb: Utilities and Probability Distributions Related to Multidimensional Person Item Response Models
`p4pl` <-
function(theta=0,a=1,b=0,c=0,d=1,lower.tail=TRUE,log.p=FALSE) {
if(lower.tail==TRUE) result <- c + (d-c)/(1+exp(-a*(theta-b)))
if(lower.tail==FALSE) result <- 1-(c + (d-c)/(1+exp(-a*(theta-b))))
if(log.p==TRUE) result <- log(result)
return(result)
}
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irtProb documentation built on May 2, 2019, 1:30 p.m.
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`p4pl` <-
function(theta=0,a=1,b=0,c=0,d=1,lower.tail=TRUE,log.p=FALSE) {
if(lower.tail==TRUE) result <- c + (d-c)/(1+exp(-a*(theta-b)))
if(lower.tail==FALSE) result <- 1-(c + (d-c)/(1+exp(-a*(theta-b))))
if(log.p==TRUE) result <- log(result)
return(result)
}
Try the irtProb package in your browser
Any scripts or data that you put into this service are public.
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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