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The model controlled for gender, age and family structure and having a missing value on any of the exposure items (parameter estimates for these covariates are not shown).
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Such IRT models also take into account some items parameters.
More, the items parameters were fixed regularly following the standardized normal distribution.
The two sets of item parameter estimates were then compared.
Item parameter estimates are surrounded by 95% confidence regions.
The item parameter invariance being multidirectional shows that continuing these types of studies is necessary.
The simultaneous appearance of both kinds of parameters may cause inconsistent item parameter estimates.
The 2PL model includes an additional item parameter, discrimination a j.
With the splitting criterion gender, for instance, item parameter estimates were compared between boys and girls.
The fixed item parameter method was used to link the test forms.
The results concerning the item parameter estimation are presented in Table 2.
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