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Chronbach’s Alpha

Chronbach’s Alpha. Ginnie Bushong. Chronbach Alpha. Also known as Alpha Coefficient An internal consistency or reliability coefficient for an instrument requiring only one test administration. General form of the KR20 formula. KR20 Formula. a = (k/k-1)(1-( Σ s i 2 /s t 2 )) When:

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Chronbach’s Alpha

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  1. Chronbach’s Alpha Ginnie Bushong

  2. Chronbach Alpha • Also known as Alpha Coefficient • An internal consistency or reliability coefficient for an instrument requiring only one test administration. • General form of the KR20 formula

  3. KR20 Formula • a = (k/k-1)(1-(Σsi2/st2)) • When: • k = number of conditions contributing to a total score • s = standard deviation • Range from 0 to 1.0 • a > .9 is excellent • a > .8 is good • a > .7 is acceptable • a > .6 is questionable • a > .5 is poor • a < .5 is unacceptable

  4. Survey Research • Validity • Will the survey provide the proper information for a researcher to determine a conclusion? • Pilot Test & Panel of Experts • Reliability • Will the survey produce consistent results? • Chronbach Alpha

  5. Quantitative Research • Meunier, R. A., Talbert, B. A. & Latour, M. A. (2002). Evaluation of the incubators in the classroom program: does it increase fourth grade students’ knowledge of agriculture-related science concepts? Journal of Agricultural Education 43(3), 49-60.

  6. Qualitative Research • Haygood, J., Baker, M., Hogg, J. & Bullock, S. (2004) The influence of foundational and expressed values on personal behaviors of teachers. Journal of Agricultural Education 45(1), 54-61.

  7. References • Chronbach, L J. (2004). My current thoughts on coefficient alpha and successor procedures. Educational and Psychological Measurement, 64(3), 391-418. Retrieved September 21, 2006 from EBSCOhost Database. • Frankel, J. R. & Wallen, N. E. (2006). How to design and evaluate research in education, sixth edition. Boston: McGraw Hill. • George, D. & Mallery, P. (2006). SPSS for Windows step by step. Boston: Pearson Education, Inc.

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