aberrance

Detect Aberrant Behavior in Test Data

https://github.com/kyliegorney/aberrance

Repository

Detect Aberrant Behavior in Test Data

README.Rmd

---
output: github_document
---



```{r, include = FALSE}
knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#>",
  fig.path = "man/figures/README-",
  out.width = "100%"
)
```

# aberrance


[![](https://www.r-pkg.org/badges/version/aberrance)](https://CRAN.R-project.org/package=aberrance)
[![](https://cranlogs.r-pkg.org/badges/grand-total/aberrance)](https://CRAN.R-project.org/package=aberrance)
[![](https://cranlogs.r-pkg.org/badges/aberrance)](https://CRAN.R-project.org/package=aberrance)


The *aberrance* package contains a collection of functions for detecting several types of aberrant behavior, including:

- **Answer copying**, using statistics such as the $\omega$ statistic (Wollack, 1997).
- **Answer similarity**, using statistics such as the $GBT$ statistic (van der Linden & Sotaridona, 2006) and the $M4$ statistic (Maynes, 2014).
- **Change point**, using statistics such as the likelihood ratio test-based statistic, the score test-based statistic, and the Wald test-based statistic (Shao et al., 2016; Sinharay, 2016; Tu et al., 2023).
- **Nonparametric misfit**, using statistics such as the $ZU3$ statistic (van der Flier, 1982) and the $H^T$ statistic (Sijtsma, 1986).
- **Parametric misfit**, using statistics such as the standardized log-likelihood statistic (Drasgow et al., 1985) and its various corrections (Bedrick, 1997; Gorney et al., 2024; Molenaar & Hoijtink, 1990; Snijders, 2001).
- **Preknowledge**, using statistics such as the signed likelihood ratio test statistic (Sinharay, 2017).
- **Rapid guessing**, using methods such as the custom threshold method (Wise et al., 2004; Wise & Kong, 2005), the normative threshold method (Wise & Ma, 2012), and the cumulative proportion correct method (Guo et al., 2016).
- **Test tampering**, using statistics such as the erasure detection index (Wollack et al., 2015; Wollack & Eckerly, 2017) and its corrected versions (Sinharay, 2018).

## Installation

Install the released version from CRAN:
```{r CRAN, eval = FALSE}
install.packages("aberrance")
```

Alternatively, install the development version from GitHub:

```{r GitHub, eval = FALSE}
# install.packages("devtools")
devtools::install_github("kyliegorney/aberrance")
```

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