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20241118 - fix typo
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isaactpetersen committed Nov 18, 2024
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where $\sigma^2(\theta)$ is the variance of theta, which is fixed to one in most IRT models.\index{item response theory}\index{item response theory!information}\index{reliability}\index{item response theory!theta}

The [`petersenlab`](https://github.com/DevPsyLab/petersenlab) package [@R-petersenlab] contains the `reliabilityiRT()` function that estimates the amount of [reliability](#irtReliability) an item or a measure provides as function of its information and the variance of people's construct levels ($\theta$).\index{petersenlab package}\index{item response theory}\index{item response theory!information}\index{reliability}\index{item response theory!theta}
The [`petersenlab`](https://github.com/DevPsyLab/petersenlab) package [@R-petersenlab] contains the `reliabilityIRT()` function that estimates the amount of [reliability](#irtReliability) an item or a measure provides as function of its information and the variance of people's construct levels ($\theta$).\index{petersenlab package}\index{item response theory}\index{item response theory!information}\index{reliability}\index{item response theory!theta}

```{r, eval = FALSE, class.source = "fold-hide"}
reliabilityIRT <- function(information, varTheta = 1){
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