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This plugin estimates parameters under Item Response Theory approach, using the <link href="rkward://rhelp/eRm-package">eRm</link> package.
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To fit the partial credit model with default settings, just the matrix of manifest variables (item responses) must be selected. Further options are described in the sections below. For detailed information on the expected layout of matrices and vectors please refer to the manual for the <link href="rkward://rhelp/PCM">PCM()</link> function.
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The complete results are stored as a new object in the current workspace for further use (e.g. plotting item characteristic curves). This object will be called <code>estimates.pcm</code>.
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<caption id="tab_data"/>
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<setting id="x" title="Matrix of manifest variables">
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Select the matrix of item responses from the objects shown on the left.
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<caption id="tab_options"/>
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By default the design matrix for the PCM will be computed automatically. Alternatively, you may specify your own design matrix here.
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<setting id="etastart">
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By default eta values start with the 0-vector. To change this, a vector of starting values can be specified.
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If checked, standard errors are computed (which is the default).
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<setting id="sumnull">
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By default parameters are normalized to sum-0 by specifying an appropriate design matrix. Uncheck this box to restrict the first parameter to 0.
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Please refer to the <code>eRm</code> manuals for further information and detailed command line options:
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<li><link href="rkward://rhelp/eRm-package"/></li>
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<li><link href="rkward://rhelp/PCM"/></li>
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