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Cronbach’s Alpha is not a Measure of Unidimensionality or Homogeneity

Cilt: 2 Sayı: 3 1 Eylül 2014
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Cronbach’s Alpha is not a Measure of Unidimensionality or Homogeneity

Öz

Reliability is a characteristic of scores, not tests or measurement instruments. One of the methods to estimate the reliability of the scores on a test or measurement instrument is Cronbach’s coefficient alpha method. In other words, Cronbach’s alpha is an estimate of the score reliability based on the internal consistency among the [item] scores. In addition to this, Cronbach’s coefficient alpha should not be interpreted as a measure of the test’s or the measurement instrument’s unidimensionality or taken as an index of the homogeneity of a measurement instrument. Briefly, Cronbach’s alpha is not a measure of unidimensionality or homogeneity.

Anahtar Kelimeler

Cronbach’s alpha, score reliability, misconception, unidimensionality, factor analysis

Kaynakça

  1. Arnold, M. E. (1996). Influences on and limitations of classical test theory reliability estimates (ERIC Document Reproduction Service No. ED 395 950).
  2. Bademci, V. (2001, November). To teach thinking and the methods-techniques used in instruction. Conference Hall of the SMMM Chamber, Bursa [Paper presented at the Conference, in Turkish].
  3. Bademci, V. (2004). It is incorrect to speak of “the reliability of the test” or “the test is reliable”. The Journal of Turkish Educational Sciences, 2 (3), 367- 372 [in Turkish].
  4. Bademci, V. (2005). On the errors inside of the arbiters evaluations: Fisher’s z transformation and sample size for reliability studies. The Journal of the Industrial Arts Education Faculty of Gazi University, 17, 46- 75 [in Turkish].
  5. Bademci, V. (2006a). To put an end to the discussion: Cronbach's alpha coefficient can be used with dichotomously scored items [0,1]. Journal of Kâzım Karabekir Education Faculty, 13, 438- 446 [in Turkish].
  6. Bademci, V. (2006b). To understand reliability properly and to overthrow some clichés: Contrary to the known facts, Cronbach’s coefficient alpha can be negative and smaller than “–1”. İnönü University Journal of the Faculty of Education, 7(12), 3- 26 [in Turkish].
  7. Bademci, V. (2006c, April). Paradigm shift: Tests are not reliable. Conference Hall of the Vocational Education Faculty of Gazi University, Ankara [Paper presented at the Conference, in Turkish].
  8. Bolton, J. E., & Humphreys, B. K. (2002). The Bournemouth Questionnaire: A short-form comprehensive outcome measure. II. psychometric properties in neck pain patients. Journal of Manipulative and Physiological Therapeutics, 25(3), 141- 148.
  9. Caci, H., Nadalet, L., Staccini, P., Myquel, M., & Boyer, P. (1999). Psychometric properties of the French version of the Composite Scale of Morningness in adults. European Psychiatry, 14, 284- 290.
  10. Capraro, M. M., Capraro, R. M., & Henson, R. K. (2001). Measurement error of scores on the mathematics anxiety rating scale across studies. Educational and Psychological Measurement, 61, 373- 386.

Kaynak Göster

APA
Bademci, V. (2014). Cronbach’s Alpha is not a Measure of Unidimensionality or Homogeneity. Journal of Computer and Education Research, 2(3), 19-27. https://izlik.org/JA98LH27DX
AMA
1.Bademci V. Cronbach’s Alpha is not a Measure of Unidimensionality or Homogeneity. JCER. 2014;2(3):19-27. https://izlik.org/JA98LH27DX
Chicago
Bademci, Vahit. 2014. “Cronbach’s Alpha is not a Measure of Unidimensionality or Homogeneity”. Journal of Computer and Education Research 2 (3): 19-27. https://izlik.org/JA98LH27DX.
EndNote
Bademci V (01 Eylül 2014) Cronbach’s Alpha is not a Measure of Unidimensionality or Homogeneity. Journal of Computer and Education Research 2 3 19–27.
IEEE
[1]V. Bademci, “Cronbach’s Alpha is not a Measure of Unidimensionality or Homogeneity”, JCER, c. 2, sy 3, ss. 19–27, Eyl. 2014, [çevrimiçi]. Erişim adresi: https://izlik.org/JA98LH27DX
ISNAD
Bademci, Vahit. “Cronbach’s Alpha is not a Measure of Unidimensionality or Homogeneity”. Journal of Computer and Education Research 2/3 (01 Eylül 2014): 19-27. https://izlik.org/JA98LH27DX.
JAMA
1.Bademci V. Cronbach’s Alpha is not a Measure of Unidimensionality or Homogeneity. JCER. 2014;2:19–27.
MLA
Bademci, Vahit. “Cronbach’s Alpha is not a Measure of Unidimensionality or Homogeneity”. Journal of Computer and Education Research, c. 2, sy 3, Eylül 2014, ss. 19-27, https://izlik.org/JA98LH27DX.
Vancouver
1.Vahit Bademci. Cronbach’s Alpha is not a Measure of Unidimensionality or Homogeneity. JCER [Internet]. 01 Eylül 2014;2(3):19-27. Erişim adresi: https://izlik.org/JA98LH27DX