The measurement error in principal components extracted from a set of fallible measures is discussed and evaluated. It is shown that as long as one or more measures in a given set of observed variables contains error of measurement, so also does any principal component obtained from the set. The error variance in any principal component is shown…

There are usually limited user evaluation of resources on a recommender system, which caused an extremely sparse user rating matrix, and this greatly reduce the accuracy of personalized recommendation, especially for new users or new items. This paper presents a recommendation method based on rating prediction using causal association rules.…

Most model fit analyses in cognitive diagnosis assume that a Q matrix is correct after it has been constructed, without verifying its appropriateness. Consequently, any model misfit attributable to the Q matrix cannot be addressed and remedied. To address this concern, this paper proposes an empirically based method of validating a Q matrix used…

A rapid method for hierarchically clustering the n objects of a matrix which portrays the interrelation of every object to every other object, where n equals any number up to 1,000 and even larger, is developed and discussed. Results compare favorably with those from other excellent methods. (Author/BJG)

The convergent and discriminant validity of common measures of three faculty competence attributes (teaching, research, and service) were investigated using multitrait-multimethod (MTMM) matrix analysis. Three different measures for each component were collected on 57 college professors. Results distinguished the three hypothesized components, but…

Three attributes of faculty competence--teaching, research, and service--were each measured by three different instruments--department chair evaluation, self-evaluation, and one other measure (student evaluations, number of publications, or number of committees). The data were analyzed through a multitrait-multimethod matrix (MTMMM) to ascertain…

Tabular procedures for analyzing open-ended responses were used to study a school district's educational reform program. Responses of a rural Arizona Career Ladder (CL) school district's teachers and administrators to three pairs of open-ended questions contained in the 1989 Perception Assessment Scale survey comprised the data base for the…