11.5 An example: research question and design

11.5.1 research question

We would like to do a ``mini’’ simulation study here to compare EAP, MLE and MAP estimation with estimated item parameters.

11.5.2 factors

We manipulated two factors:

• sample size

• test length

We fixed the following factors:

• Number of attributes = 5

• Generating model = DINA

• Fitted model = DINA

11.5.3 conditions

We consider two levels for sample size factor: small (N=100) and moderate (N=500)

We consider two levels for test length: short test (J=15) and long test (J=60)

11.5.4 design

fully-crossed => four condition combinations