In the context of IRT, some researchers have stated that simple 1PL models may be run with as few as 50 participants (Linacre, 1994), and 2PL models require a minimum of 250 individuals; however, several authors have recommended a sample of 500 for accurate parameter estimates in the 2PL model (Baur & Lukes, 2009; Embretson & Reise, 2000).
Petscher (2010)
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