From alpha to omega: A practical solution to the pervasive problem of internal consistency estimation

British Journal of Psychology - Tập 105 Số 3 - Trang 399-412 - 2014
Thomas J. Dunn1, Thom Baguley1, V Brunsden1
1Division of Psychology, Nottingham Trent University, UK.

Tóm tắt

Coefficient alpha is the most popular measure of reliability (and certainly of internal consistency reliability) reported in psychological research. This is noteworthy given the numerous deficiencies of coefficient alpha documented in the psychometric literature. This mismatch between theory and practice appears to arise partly because users of psychological scales are unfamiliar with the psychometric literature on coefficient alpha and partly because alternatives to alpha are not widely known. We present a brief review of the psychometric literature on coefficient alpha, followed by a practical alternative in the form of coefficient omega. To facilitate the shift from alpha to omega, we also present a brief guide to the calculation of point and interval estimates of omega using a free, open source software environment.

Từ khóa


Tài liệu tham khảo

10.1037/0003‐066X.63.1.32

10.1037/0003‐066X.45.6.721

Baguley T., 2008, The perils of statistics by numbers, The Psychologist, 21, 224

10.1348/000712608X377117

10.1007/978-0-230-36355-7

10.1037/0021‐9010.78.1.98

10.1007/BF02310555

10.1177/0013164404266386

10.1002/sim.4134

10.1016/j.soscij.2012.02.001

Field A., 2012, Discovering statistics using R

10.1177/0013164406288165

10.1207/S15328007SEM0702_6

10.1177/001316447703700403

10.1007/s11336‐008‐9098‐4

10.1177/00131640021970691

Huysamen G., 2007, Coefficient alpha: Unnecessarily ambiguous; unduly ubiquitous, SA Journal of Industrial Psychology, 32, 34

10.1207/S15327663JCP1304_14

10.1007/BF02291393

10.1027/1614‐2241/a000036

Kelley K. &Lai K.(2012).MBESS: MBESS. R package version 3.3.2. Retrieved fromhttp://CRAN.R-project.org/package=MBESS

10.1037/a0028086

10.1111/j.2044‐8317.1964.tb00253

Lord F. I., 1968, Statistical theories of mental test scores

10.1111/j.2044‐8317.1981.tb00621.x

McDonald R. P., 1999, Test theory: A unified treatment

10.1080/10705519509540013

Nunnally B. H., 1994, Psychometric theory

R Development Core Team, 2012, R: A language and environment for statistical computing

10.1177/01466216970212006

10.1177/01466216970212006

10.1177/014662169802200407

10.1207/s15327906mbr3204_2

10.1348/000711006X115954

10.1007/s11336‐008‐9102‐z

Rizopoulos(2012). ltm. R package version 0.9‐9. Retrieved fromhttp://CRAN.R-project.org/package=ltm

10.1016/S0191-8869(99)00093-8

10.1007/s11336‐008‐9101‐0

Soĉan G., 2000, Assessment of reliability when test items are not essentially tau‐equivalent, Advances in Methodology and Statistics, 15, 23

10.1111/j.2044‐8317.2011.02030.x

10.1177/0013164400602002

10.1002/j.1556‐6678.2002.tb00167.x

10.1177/0146621607300860

10.1037/0003‐066X.54.8.594

10.1177/0734282911406668

10.1007/BF02294845

10.1177/0013164493053001003

10.1177/0146621606291558

10.1007/s11336‐003‐0974‐7

10.1177/0146621605278814

Thông tin
Thông tin xuất bản

British Journal of Psychology

Tập 105 Số 3

399-412

Thông tin tác giả