R/Pr.R
In jagonzalb/SNSequate: Standard and Nonstandard Statistical Models and Methods for Test Equating
### "Pr" provides the 3PL item response curve, or the probability that subject
### will give a correct answer to the item using the logistic model.
### Requires the value "theta" of ability, and the three item parameter values:
### "b" for difficulty, "a" for discrimination (by-default value of 1) and "c"
### for pseudo-guesing (by-default value of 0).
Pr<-function(theta,b,a=1,c=0) c+(1-c)/(1+exp(-a*(theta-b)))
jagonzalb/SNSequate documentation built on May 18, 2019, 9:07 a.m.
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### "Pr" provides the 3PL item response curve, or the probability that subject
### will give a correct answer to the item using the logistic model.
### Requires the value "theta" of ability, and the three item parameter values:
### "b" for difficulty, "a" for discrimination (by-default value of 1) and "c"
### for pseudo-guesing (by-default value of 0).
Pr<-function(theta,b,a=1,c=0) c+(1-c)/(1+exp(-a*(theta-b)))
R Package Documentation
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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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