caa a22 4500 606179666 CHVBK 20210128100802.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s11136-014-0816-3 doi (NATIONALLICENCE)springer-10.1007/s11136-014-0816-3 Measuring quality of life with fuzzy numbers: in the perspectives of reliability, validity, measurement invariance, and feasibility [Elektronische Daten] [Po-Yi Chen, Grace Yao] Purpose: Fuzzy set theory (FST) can improve various aspects of measurement with questionnaires. However, very little is known about how to use FST to measure quality of life (QOL). The main purpose of our study was to find an appropriate fuzzy measure for QOL that, while demonstrating the advantages of FST, can also be compared with mainstream QOL measures, most of which use traditional Likert-type scales. Methods: Referring to the literature on fuzzy scoring methods, we first revised the measurement scale and scoring method of the traditional WHOQOL-BREF (i.e., a five-point Likert-type scale) to create three versions of a fuzzy WHOQOL-BREF. Then, we examined the psychometric relationships of these three fuzzy measures and the traditional WHOQOL-BREF in a within-subject design. Results: Our results show that a fuzzy-scales weighted-by-membership (FSWM) version of the WHOQOL-BREF is comparable to the traditional WHOQOL-BREF in that it accepts strong invariance and shows almost perfect agreement. It also demonstrates higher reliability and face validity than the traditional WHOQOL-BREF. Conclusion: We recommend that future studies examine the use of FSWM to measure QOL. Springer International Publishing Switzerland, 2014 WHOQOL-BREF nationallicence Fuzzy set theory nationallicence Measurement invariance nationallicence Feasibility nationallicence Chen Po-Yi Department of Psychology, University of Kansas, 1415 Jayhawk Blvd.Fraser Hall, Room 426, 66045-7556, Lawrence, KS, USA aut Yao Grace Department of Psychology, National Taiwan University, 1, Sec. 4, Roosevelt RD., Taipei, Taiwan aut Quality of Life Research Springer International Publishing 24/4(2015-04-01), 781-785 0962-9343 24:4<781 2015 24 11136 https://doi.org/10.1007/s11136-014-0816-3 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 brief-communication jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11136-014-0816-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chen Po-Yi Department of Psychology, University of Kansas, 1415 Jayhawk Blvd.Fraser Hall, Room 426, 66045-7556, Lawrence, KS, USA aut NATIONALLICENCE 700 1- Yao Grace Department of Psychology, National Taiwan University, 1, Sec. 4, Roosevelt RD., Taipei, Taiwan aut NATIONALLICENCE 773 0- Quality of Life Research Springer International Publishing 24/4(2015-04-01), 781-785 0962-9343 24:4<781 2015 24 11136