  Estimates for the reliability of Thurstone's regression factor score
predictor, Bartlett's factor score predictor, and McDonald's factor score
predictor were proposed. As in Kuder-Richardson's formula, the reliability
estimates are based on a hypothetical set of equivalent items. The reliability
estimates were compared by means of simulation studies. Overall, the
reliability estimates were largest for the regression score predictor, so that
the reliability estimates for Bartlett's and McDonald's factor score predictor
should be compared with the reliability of the regression score predictor,
whenever Bartlett's or McDonald's factor score predictor are to be computed. An
R-script and an SPSS-script for the computation of the respective reliability
estimates is presented.
