4 research outputs found
Percentage distribution of item responses on the SF-36 physical functioning and mental health sub-scale items in the Canadian Multicentre Osteoporosis Study.
<p>Percentage distribution of item responses on the SF-36 physical functioning and mental health sub-scale items in the Canadian Multicentre Osteoporosis Study.</p
Regression coefficient estimates for the effects of demographic and health status variables on physical functioning and mental health latent variables in models without differential item functioning (no-DIF) and with differential item functioning (DIF) in the Canadian Multicentre Osteoporosis Study.
<p>Regression coefficient estimates for the effects of demographic and health status variables on physical functioning and mental health latent variables in models without differential item functioning (no-DIF) and with differential item functioning (DIF) in the Canadian Multicentre Osteoporosis Study.</p
Illustration of the multiple indicators multiple causes model to test for differential item functioning on SF-36 sub-scale items.
<p>In this model, <i>y</i><sub><i>i</i></sub> is the <i>i</i>th sub-scale item (<i>i</i> = 1, …, <i>I</i>); the dashed arrow from each covariate to the item represents the DIF (i.e., direct) effect; <i>β</i><sub><i>1Sex</i></sub> is the regression coefficient for the difference in thresholds on item <i>i</i> for males and females; similar regression coefficients are defined for other model covariates; <i>α</i><sub><i>i</i></sub> is the regression coefficient for the latent variable and the <i>i</i>th item; <i>γ</i><sub><i>k</i></sub> is the regression coefficient for the latent variable and the <i>k</i>th covariate (<i>k</i> = 1, …, <i>K</i>); <i>τ</i><sub><i>ij</i></sub> is the threshold for the (<i>j</i>– 1) th response category <i>(j</i> = 1, <i>…</i>,<i>J</i>) for item <i>i</i>; <i>ε</i><sub><i>i</i></sub> is the error term for the <i>i</i>th item; <i>ζ</i> is the residual error for the latent variable.</p
Tests for differential item functioning on the SF-36 physical functioning and mental health sub-scale items in the Canadian Multicentre Osteoporosis Study.
<p>Tests for differential item functioning on the SF-36 physical functioning and mental health sub-scale items in the Canadian Multicentre Osteoporosis Study.</p