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# dcmdata <a href="https://dcmdata.r-dcm.org"><img src="man/figures/logo.png" align="right" height="138" alt="dcmdata website" /></a>

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The goal of dcmdata is to provide easy access to data sets for use with
diagnostic classification models.

## Installation

You can install the released version of dcmdata from
[CRAN](https://cran.r-project.org/) with:

``` r
install.packages("dcmdata")
```

And the development version from [GitHub](https://github.com/) with:

``` r
# install.packages("pak")
pak::pak("r-dcm/dcmdata")
```

## About the data

dcmdata contains both real and simulated data sets for educational and
psychological assessment. For more information on each data set, see the
linked reference pages.

### Real data sets

- [ECPE](https://dcmdata.r-dcm.org/reference/ecpe.html): Assessment data
  from the Examination for the Certificate of Proficiency in English, as
  described in [Templin and Hoffman
  (2013)](https://doi.org/10.1111/emip.12010).
- [Fraction](https://dcmdata.r-dcm.org/reference/fraction.html): The
  fraction subtraction data described by [Tatsuoka
  (2002)](https://doi.org/10.1111/1467-9876.00272).
- [MCMI](https://dcmdata.r-dcm.org/reference/mcmi.html): Psychological
  assessment data from the Millon Clinical Multiaxial Inventory-III, as
  described in [Rossi et
  al. (2010)](https://doi.org/10.1521/pedi.2010.24.1.128).
- [MDM](https://dcmdata.r-dcm.org/reference/mdm.html): A short integer
  multiplication assessment, as described in [MacReady and Dayton
  (1977)](https://doi.org/10.2307/1164802).
- [PIE](https://dcmdata.r-dcm.org/reference/pie.html): Assessment data
  from the Pathways for Instructionally Embedded Assessment data, as
  described by [ATLAS
  (2025)](https://pie.atlas4learning.org/sites/default/files/documents/resources/PIE_Pilot_Study_Design_and_Administration_Evidence.pdf).
- [ROAR-PA](https://dcmdata.r-dcm.org/reference/roarpa.html): Data from
  the Rapid Online Assessment of Reading and Phonological Awareness, as
  described by [Gijbels et
  al. (2024)](https://doi.org/10.1038/s41598-024-60834-9).
- [TIMSS-03](https://dcmdata.r-dcm.org/reference/timss03.html): Data
  from the 2003 grade 8 Trends in International Mathematics and Science
  Study, as describe by [Skaggs et
  al. (2016)](https://doi.org/10.1080/15305058.2016.1145683).
- [TIMSS-07](https://dcmdata.r-dcm.org/reference/timss07.html): Data
  from the 2007 grade 4 Trends in International Mathematics and Science
  Study, as describe by [Park et
  al. (2011)](https://doi.org/10.1080/15305058.2010.534571).

### Simulated data sets

- [DTMR](https://dcmdata.r-dcm.org/reference/dtmr.html): A data set
  based on the Diagnostic Teachers’ Multiplicative Reasoning assessment,
  described in [Bradshaw et
  al. (2014)](https://doi.org/10.1111/emip.12020).

------------------------------------------------------------------------

## Contributions and Code of Conduct

Contributions are welcome. To ensure a smooth process, please review the
[Contributing Guide](https://dcmdata.r-dcm.org/CONTRIBUTING.html).
Please note that the dcmdata project is released with a [Contributor
Code of Conduct](https://dcmdata.r-dcm.org/CODE_OF_CONDUCT.html). By
contributing to this project, you agree to abide by its terms.
