PsyControl v1.0.0.0
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CUSUM Person Fit Statistics
Person fit statistics based on Quality Control measures are provided for questionnaires and tests given a specified IRT model. Statistics based on Cumulative Sum (CUSUM) charts are provided. Options are given for banks with polytomous and dichotomous data.
Functions in PsyControl
| Name | Description | |
| cusum | Generates CUSUM values for Rasch, 2PL and 3PL IRT model based on the Van Krimpen-Stoop & Meijer, (2002). | |
| cusum.cutoff | Generates critical values for CUSUM statisitcs. | |
| exGRM | Example data set based on a simulated GRM model. | |
| gh | Example data set based on a simulated GRM model. | |
| cusum.poly | Generates CUSUM values for polytomous IRT model based on Van Krimpen-Stoop & Meijer, (2002). | |
| ex2PL | Example data set based on a simulated 2PL model. | |
| cusum.flag | Flags aberrant participants based on CUSUM statistics. | |
| cusum.plot | Generates CUSUM plot for specified IDs. | |
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