This was tested by evaluation of the mean square Infit (Infit MNSQ) and mean square Outfit (Outfit MNSQ) fit statistics.
Infit MNSQ: mean square Infit, Outfit MNSQ: mean square Outfit, ZSTD: standardized as a z-score, DIF: differential item functioning, BMI: body-mass index, N/A: not available.
There are two commonly used mean square fit statistics, namely the infit mean square (also referred to as the weighted mean square) and outfit (or unweighted) mean square.
Two commonly employed fit statistics to assess item fit are the weighted mean square or infit statistic, and the unweighted mean square or outfit statistics.
The majority of items showed mean square infit and outfit statistics within the 0.6 and 1.4 range, save for item 5 (Hard to take a bath or shower) of the physical health scale and item 3 (Teased) of the social functioning scale for child self-report.
δ average item challenge, SE standard error of the item challenge, Infit infit mean square statistic, Oufit outfit mean square statistic aThe original item 9 was reversed in these analyses Note.
There was little sign of the late drama at Moss Rose as Blue Square Bet Premier outfit Macclesfield failed to pressurise Cardiff's youngsters in the closing stages.
Thus, the infit mean-square and outfit mean-square values considered a recommended interval of 0.50 to 1.50 (Linacre 2002), with values closer to 1.0 indicating a better explanation by the model and values above 1.50 as degrading the measurement system.
