Background model in Conquest 3.0

[AnnaVol]

Hallo,

as far as I know, 2PL in Conquest 3.0 works only with constraints=cases, but you usually need constraints=none for estimating the background model. That means, that it is not possible to rightly estimate 2PL background model in Conquest 3.0 or?

Thank you in advance!

[Eveline Gebhardt]

Hi

You can use constraints=cases with a regression model. The intercept will be fix to zero, while the regression coefficients will be estimated.

Eveline