Person Fit
Agreement, disagreement, and dependability statistics
C.Sato, Cstar person-fit statistics
Compute a cutoff value given the scores of a person-fit statistic
Find (potentially) aberrant response patterns
Number of Guttman errors
Number of Guttman errors for polytomous items
Ht person-fit statistic
lz and lzstar person-fit statistics
lzpoly person-fit statistic
NCI person-fit statistic
tools:::Rd_package_title("PerFit")
Compute several person-fit statistics
Compute standard errors for person fit statistics
Plot method for objects of class "PerFit"
Person response function (PRF)
Print method for objects of class "PerFit"
Personal biserial statistic
Summary method for objects of class "PerFit"
U3, ZU3 person-fit statistics
U3poly person-fit statistic
Several person-fit statistics (PFSs; Meijer and Sijtsma, 2001, <doi:10.1177/01466210122031957>) are offered. These statistics allow assessing whether individual response patterns to tests or questionnaires are (im)plausible given the other respondents in the sample or given a specified item response theory model. Some PFSs apply to dichotomous data, such as the likelihood-based PFSs (lz, lz*) and the group-based PFSs (personal biserial correlation, caution index, (normed) number of Guttman errors, agreement/disagreement/dependability statistics, U3, ZU3, NCI, Ht). PFSs suitable to polytomous data include extensions of lz, U3, and (normed) number of Guttman errors.