Ramsay described a non-parametric form of IRT based on kernel density smoothing. However, Ramsay's work seems never to have gained much attention (not even objections from proponents of competing models), but I was trying to find at least some example of how it has been applied beyond the original descriptions by Ramsay.
Is anyone aware of any that have been published in peer-reviewed journals?
Bonus points if you know of a study in psychology or medicine using kernel density smoothing IRT.
Here are some articles in Psychology journals:
Santor & Ramsay (1998). Progress in the technology of measurement: Applications of item response models. Psychological Assessment, 10, 354-359.
Santor, Zuroff, Ramsay, Cervantes, & Palacios (1995). Examining Scale Discriminability in the BDI and CES-D as a Function of Depressive Severity. Psychological Assessment, 7, 131-139.
Sodano, S. M., & Tracey, T. J. G. (2011). A brief Inventory of Interpersonal Problems-Circumplex using non-parametric Item Response Theory: Introducing the IIP-C-IRT. Journal of Personality Assessment, 93, 62–75.
Sodano, Tracey, & Hafkenscheid (2013). A brief Dutch language Impact Message Inventory–Circumplex (IMI-C Short) using non-parametric item response theory. Psychotherapy Research. DOI:10.1080/10503307.2013.847984
I hope this helps.
Deon de Bruin
There is an R porting of Ramsay's software, with some additional features, check package KernSmoothIRT'.
Bye
Angelo Mazza
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