R 등급반응모형 (Environment)

1 개요

R 등급반응모형 - Environment 예시

R

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df <- read.csv("https://raw.githubusercontent.com/jmnote/zdata/master/github.com/cran/ltm/data/Environment.csv")
library(ltm)
model <- grm(df)

cat('로그우도:', model$log.Lik, "\n")
cat('AIC:', summary(model)$AIC, "\n")
cat('BIC:', summary(model)$BIC, "\n")

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# 계수
coef(model)

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# 문항특성곡선
plot.grm(model)

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# 문항정보곡선
plot(model, "IIC")

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# 검사정보곡선
plot(model, "IIC", items=0)

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# 모집단 능력 분포 추정 (커널 밀도)
plot(factor.scores(model))

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# 참가자 능력 분포 (히스토그램)
temp <- factor.scores(model)[[1]]
temp <- as.vector(rep(temp$z1, temp$Obs))
hist(temp)

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• R 등급반응모형