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66 lines
2.3 KiB
Plaintext
66 lines
2.3 KiB
Plaintext
7 months ago
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{smcl}
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{* Mars 2012}{...}
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{hline}
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help for {hi:pcmtest}{right:JFH}
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{hline}
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{title:Global and item specific tests of the fit for Partial Cradit Model}
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{p 8 14 2}{cmd:pcmtest}, [{cmdab:g:roup}({it:numlist})
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{cmdab:n:fit}(#)
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{cmdab:p:ower}(#)
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{cmdab:graph:ics}(#)
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{cmdab:a:lpha}(#)
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{cmdab:ap:proximation}
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{cmdab:n:ew}]
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{title:Description}
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{p 8 14 2}{cmd:pcmtest} allows to test the fit between an observed data and the
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partial credit model.{p_end}
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{p 14 14 2}The global test of the fit (test R1m) can only be computed if the data
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contains at least two items. Item specific test of the fit (Si tests) can only be
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computed if the data contains at least three items. {p_end}
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{p 14 14 2}{cmd:pcmtest} is only performed if item difficulties have been
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estimated using {cmd:pcmodel}. {cmd:pcmtest} can be performed either if covariates
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have been included in {cmd:pcmodel} or not.
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{title:Options}
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{p 4 8 2}{cmd:group} specifies groups of scores, by defining the superior limits of
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each group
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{p 4 8 2}{cmd:nfit} specifies the size of a virtual sample with items response
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distribution strictly identical to that observed ({cmd:nfit} can deal with
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over-power problems when tests of the fit are performed on large samples).
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{p 4 8 2}{cmd:power} specifies the desired power for a test R1m, and estimates the
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corresponding size of a virtual sample with items response distribution strictly
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identical to that observed.
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{p 4 8 2}{cmd:alpha} specifies the type I error used to performe the tests of the fit
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(default: 0.05).
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{p 4 8 2}{cmd:graphics} displays several graphs (Graphical fit between the observed and
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expected latent traits according to the individual scores, graphic of MAP, graphic of
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groups contribution to the R1m statistic, and graphice of the observed and expected
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score distribution)
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{p 4 8 2}{cmd:approximation} Computation of the pattern response probabilities using
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simulation instead of Gauss Hermitte quadratures. Computation should be quicker for
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high number of items or responses modalities.
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{p 4 8 2}{cmd:new} Do not use pattern response probabilities computed during a previous
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test of the fit, compute it an other time! (allows changing the computation methodology)
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{title:Author}
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{p 4 8 2}Jean-François HAMEL{p_end}
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{title:Also see}
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{p 4 13 2}Online: help for {help pcmodel}, {help gllamm}, {help simirt}
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, {help raschtest}.{p_end}
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