Measuring traitedness with person reliabilities parameters

This study demonstrates how person reliability parameters (PRPs) in variable-θ item response theory models can be used to reflect of traitedness. PRPs are person parameters that represent change in individuals' attribute levels across items. Greater values for PRPs indicate greater response consistency. PRPs may reflect traitedness because highly traited individuals should have less variability of the attribute level across items. Item data from the 16PF and HEXACO personality frameworks were analyzed to provide some evidence that PRPs reflect traitedness. •This study demonstrates traitedness can be measured using how person reliability parameters (PRPs).•Item data from the 16PF and HEXACO personality frameworks were analyzed.•Results suggest that PRPs may be useful indicators of traitedness.