This is a repository for sharing information, results, and code generated by the Network for Investigation of Delirium: Unifying Scientists (NIDUS) measurement core and related projects.
Supporting materials for Helfand, B. K. I., Detroyer, E., Milisen, K., Adamis, D., Metzger, E. D., Boudreaux, E. D., Inouye, S. K., & Jones, R. N. (2022). Harmonization of Four Delirium Instruments: Creating Crosswalks and the Delirium Item-Bank (DEL-IB). American Journal of Geriatric Psychiatry, 30(3), 284-294. https://doi.org/10.1016/j.jagp.2021.07.011
The DEL-IB item bank contains item parameters on the logistic (2PL for binary items, graded response model for categorical items) scaling metric. Parameter values are labeled "a" for discrimination parameters and "b#" for difficulty parameters, where # takes on values 1,2, or 3 and indicates the threshold number for items with 2, 3 or 4 response categories. The Stata code is an example of using gsem in Stata to obtain latent trait estimates when some/all of the item parameters are constrained. See here for an example (and discussion) of doing the sample with Mplus.
- Code (Stata do-file)
- Item bank (DEL-IB) (csv)
- Cross-walk spreadsheets
Supporting materials for Gross, A. L., Tommet, D., D'Aquila, M., Schmitt, E., Marcantonio, E. R., Helfand, B., . . . Basil Study Group. (2018). Harmonization of delirium severity instruments: a comparison of the DRS-R-98, MDAS, and CAM-S using item response theory. BMC Med Res Methodol, 18(1), 92. doi:10.1186/s12874-018-0552-4
Last update: 2025-01-06