A fuzzy set theory solution to combining Likert items into a single overall scale (or subscales)

Fuzzy sets

L. A. Zadeh · Information and Control · 1965 · 64.9K citations

Evaluating the use of exploratory factor analysis in psychological research.

Leandre R. Fabrigar, Duane T. Wegener, Robert C. MacCallum et al. · Psychological Methods · 1999 · 8.6K citations

Behavioral Sciences, Psychopathology, Personality Psychology +13

Constructing validity: Basic issues in objective scale development.

Lee Anna Clark, David Watson · Psychological Assessment · 1995 · 6.3K citations

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SPSS and SAS programs for determining the number of components using parallel analysis and Velicer’s MAP test

Brian P. O’Connor · Behavior Research Methods, Instruments, & Computers · 2000 · 4K citations · Full text

Parallel Analysis, Engineering, Map Test +7

Understanding and Using Factor Scores: Considerations for the Applied Researcher

Christine DiStefano, Min Zhu, Diana Mîndrilă · Scholarworks (University of Massachusetts Amherst) · 2020 · 1.6K citations · Full text