Cronbach's Alpha Values - Revision history

Admin at 14:52, 11 May 2020

2020-05-11T14:52:09Z

2020-05-11T14:51:31Z

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2019-12-15T18:51:08Z

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 ''contributed by Frank LaBanca, EdD''
-See also Interpreting Cronbach's Alpha
+See also [[Interpreting Cronbach's Alpha]]
 Cronbach's alpha measures internal consistency, meaning how much the items on a scale actually measure the same dimension. For example, when considering instrumentation for quantitative research, part of assessing a reliable instrument would include reviewing the Cronbach's alpha values for the scales. An example of this is reported below, for the School Attitudes Assessment Survey - Revised (SAAS-R):

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 ''contributed by Frank LaBanca, EdD''
-See also 'Cronbachalpha.png'
+See also Interpreting Cronbach's Alpha
 Cronbach's alpha measures internal consistency, meaning how much the items on a scale actually measure the same dimension. For example, when considering instrumentation for quantitative research, part of assessing a reliable instrument would include reviewing the Cronbach's alpha values for the scales. An example of this is reported below, for the School Attitudes Assessment Survey - Revised (SAAS-R):

@@ Line 26: / Line 26: @@
 ''contributed by Frank LaBanca, EdD''
 Cronbach's alpha measures internal consistency, meaning how much the items on a scale actually measure the same dimension. For example, when considering instrumentation for quantitative research, part of assessing a reliable instrument would include reviewing the Cronbach's alpha values for the scales. An example of this is reported below, for the School Attitudes Assessment Survey - Revised (SAAS-R):
 As reported by McCoach and Siegle (2003), the scores demonstrated a classical theory internal consistency reliability coefficient of at least .85 on each of the five factors.
-McCoach, D. B., & Siegle, D. (2003). The school attitude assessment survey – revised: A new instrument to identify academically able
+McCoach, D. B., & Siegle, D. (2003). The school attitude assessment survey – revised: A new instrument to identify academically able students who underachieve.
-     students who underachieve. ''Educational and Psychological Measurement, 63''(3), 414-429. DOI: 10.1177/0013164402251057.
+''Educational and Psychological Measurement, 63''(3), 414-429. DOI: 10.1177/0013164402251057.
 ''contributed by Lauren Moyer''

← Older revision		Revision as of 14:46, 11 May 2020
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	''contributed by Lauren Moyer''		''contributed by Lauren Moyer''
		+
		+	Cronbach's Alpha is a measure of the correlations between all the variables that make up a scale. The concept behind this measure is to determine if items measure the same concept. If so, they will be highly correlated and have a high alpha, indicating a high level of internal consistency. However, the more items in a particular scale, the higher the alpha tends to be, even if the items don't measure the same thing. It is suggested that the researcher should also run a factor analysis to strengthen the reliability of the scale (Muijs, 2011).
		+
		+	''contributed by Joseph W. Sullivan''

← Older revision		Revision as of 18:51, 15 December 2019
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	students who underachieve. ''Educational and Psychological Measurement, 63''(3), 414-429. DOI: 10.1177/0013164402251057.		students who underachieve. ''Educational and Psychological Measurement, 63''(3), 414-429. DOI: 10.1177/0013164402251057.

−	"contributed by Lauren Moyer"	+	''contributed by Lauren Moyer''

← Older revision		Revision as of 15:22, 13 December 2019
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	''contributed by Frank LaBanca, EdD''		''contributed by Frank LaBanca, EdD''
		+
		+
		+	Cronbach's alpha measures internal consistency, meaning how much the items on a scale actually measure the same dimension. For example, when considering instrumentation for quantitative research, part of assessing a reliable instrument would include reviewing the Cronbach's alpha values for the scales. An example of this is reported below, for the School Attitudes Assessment Survey - Revised (SAAS-R):
		+	As reported by McCoach and Siegle (2003), the scores demonstrated a classical theory internal consistency reliability coefficient of at least .85 on each of the five factors.
		+
		+	McCoach, D. B., & Siegle, D. (2003). The school attitude assessment survey – revised: A new instrument to identify academically able
		+	students who underachieve. ''Educational and Psychological Measurement, 63''(3), 414-429. DOI: 10.1177/0013164402251057.
		+
		+	"contributed by Lauren Moyer"

← Older revision		Revision as of 20:08, 9 October 2019
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−	contributed by Frank LaBanca, EdD	+	''contributed by Frank LaBanca, EdD''

← Older revision		Revision as of 20:08, 9 October 2019
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	\|}		\|}
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		+	contributed by Frank LaBanca, EdD

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 |-
-|<0.8 ≤ α < 0.9
+|0.8 ≤ α < 0.9
 |Good
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 |}

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 Internal consistency
 Cronbach's alpha	Internal consistency
-.9 ≤ α	Excellent
-.8 ≤ α < 0.9	Good
 .7 ≤ α < 0.8	Acceptable