Overview of MNLFA for DIF and Impact Assessment Quiz

Section 2: An Overview of MNLFA for DIF and Impact Assessment Please put into Slide Show Mode to begin interactive Quiz (Slide Show From Beginning) Instructions Click on responses to select answer. Once selected, you can click on the same box to show original text. Use navigation arrows to advance to next question Question 1 Question 1

Knowledge Check 1 What does the term ?? represent in the equation ????? 1 = ??+ ?? ???= ????+ ??+ ?? ??? This description applies to the non-bolded ?? ?? is the item intercept when all background variables take value 0 that is, the baseline intercept. A ?? is a vector of parameters, each of which represents the impact of This describes impact (i.e. the distribution level), but the equation presented is for DIF (i.e. the item level). a specific covariate on the mean of the ? distribution. B This is correct. The vector is the same length as the number of background variables/covariates, with each value corresponding to a particular variable s influence on the item s intercept. With a specific number of background variables, e.g. 2, this vector can be replaced with a parameter for each variable like so: ????? 1 = ??+ ?1??1?+ ?2??2???+ ??+ ?1? ?1?+?2? ?2? a specific covariate on the intercept of item j. ?? is a vector of parameters, each of which represents the impact of C ???= Previous Question Next Question Previous Question Next Question

Knowledge Check 2 What is variance impact? This is the correct answer. Variance impact is the phenomenon of the variance of the distribution differing as a function of one or more background variables. A This describes slope DIF, or non-uniform DIF. Variance impact is the phenomenon of the slope of one or more items being moderated by one or more background variables. B Variance impact is when scores on the instrument are systematically higher or lower on average as a function of one or more background This describes mean impact. variables. C Previous Question Next Question Previous Question Next Question

Knowledge Check In terms of the 2PL s discrimination and difficulty parameters, the term ?? following equation represents moderation of which parameter, assuming the latent variable is scaled according to IRT convention? ????? ???= 1 = ??+ ?? ?? ?? ?? in the 3 ????+ ??+ There is no direct moderation of difficulty in this equation rather, ?? represents moderation of the intercept, which is a linear transformation of the difficulty in the canonical 2PL. ?? This represents moderation of the difficulty parameter. A Because, when the latent variable is scaled as N(0,1) when all background variables are zero per IRT convention, ??= ??, the vector ?? moderation of item discrimination by each of the background variables in z_i. This represents moderation of the discrimination parameter. ?? represents B When the latent variable is scaled according to IRT convention, no transformation is needed see correct answer. discrimination parameter. This represents moderation of a linear transformation of the C Previous Question Next Question Previous Question Next Question

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