Description Usage Arguments Details Value References See Also Examples
View source: R/transformations.R
Convert the b vector of item parameters (polynomial coefficients) to the corresponding Greek-letter parameterization (used to ensure monotonicitiy).
1 | b2greek(bvec, ncat = 2, eps = 1e-08)
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bvec |
b vector of item parameters (i.e., polynomial coefficients). |
ncat |
Number of response categories (first ncat - 1 elements of bvec are intercepts) |
eps |
Convergence tolerance. |
See greek2b for more information about the b (polynomial coefficient) and Greek-letter parameterizations of the FMP model.
A vector of item parameters in the Greek-letter parameterization.
Liang, L., & Browne, M. W. (2015). A quasi-parametric method for fitting flexible item response functions. Journal of Educational and Behavioral Statistics, 40, 5–34. doi: 10.3102/1076998614556816
greek2b
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