TY - JOUR
T1 - A brief Dutch language Impact Message Inventory-Circumplex (IMI-C Short) using non-parametric item response theory
AU - Sodano, Sandro M.
AU - Tracey, Terence
AU - Hafkenscheid, Anton
PY - 2014/9
Y1 - 2014/9
N2 - Objective: Non-Parametric IRT methods were applied to 127 clinicians' ratings of their patients using the Dutch Impact Message Inventory-Circumplex (IMI-C) to develop the IMI-C Short. Method: Four items from each octant subscale of the IMI-C were selected to maximally differentiate individuals along the continuum of impact messages. Results: Using larger samples (patients: N = 700, 812; raters: N = 42, 85, respectively), IRT-based reliability was generally comparable between the brief and parent subscales. Classical Test Theory-based reliability was adequate for the brief subscales and they converged with their parent subscales. Since the IMI-C is purported to represent the circular arrangement of impact messages, the fits of the parent and abbreviated scales were assessed and found to be good and not differ significantly. Conclusion: The new IMI-C Short offers advantages over the full-length IMI-C.
AB - Objective: Non-Parametric IRT methods were applied to 127 clinicians' ratings of their patients using the Dutch Impact Message Inventory-Circumplex (IMI-C) to develop the IMI-C Short. Method: Four items from each octant subscale of the IMI-C were selected to maximally differentiate individuals along the continuum of impact messages. Results: Using larger samples (patients: N = 700, 812; raters: N = 42, 85, respectively), IRT-based reliability was generally comparable between the brief and parent subscales. Classical Test Theory-based reliability was adequate for the brief subscales and they converged with their parent subscales. Since the IMI-C is purported to represent the circular arrangement of impact messages, the fits of the parent and abbreviated scales were assessed and found to be good and not differ significantly. Conclusion: The new IMI-C Short offers advantages over the full-length IMI-C.
KW - IMI-CS
KW - Impact Message Inventory-Circumplex
KW - Impact Message Inventory-Circumplex Short
KW - interpersonal circle
KW - non-parametric item response theory
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U2 - 10.1080/10503307.2013.847984
DO - 10.1080/10503307.2013.847984
M3 - Article
C2 - 24188739
AN - SCOPUS:84904506188
SN - 1050-3307
VL - 24
SP - 616
EP - 628
JO - Psychotherapy Research
JF - Psychotherapy Research
IS - 5
ER -