Recently, Liu et al. (2019) compared several methods of calculating overall and domain scores based on the bifactor model. Domain scores are subscores based on sets of items intended to… Click to show full abstract
Recently, Liu et al. (2019) compared several methods of calculating overall and domain scores based on the bifactor model. Domain scores are subscores based on sets of items intended to measure the same skill or area of knowledge. Each of the methods involves estimating ability for examinee j on the general factor ûjG and each residual specific factor ûjs. One then forms a composite overall and for each domain s:
               
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