Archive:Advanced ANOVA/Assumptions - Revision history

wikademia>Wikademia: moved Advanced ANOVA/Assumptions to Archive:Advanced ANOVA/Assumptions

2009-05-27T05:49:29Z

moved Advanced ANOVA/Assumptions to Archive:Advanced ANOVA/Assumptions

← Older revision	Revision as of 05:49, 27 May 2009
(No difference)

wikademia>Wikademia at 17:38, 11 April 2009

2009-04-11T17:38:36Z

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	[[Category:{{BASEPAGENAME}}]]		[[Category:{{BASEPAGENAME}}]]
	</noinclude>		</noinclude>{{ntnes}}

wikademia>Wikademia at 05:35, 11 April 2009

2009-04-11T05:35:11Z

← Older revision		Revision as of 05:35, 11 April 2009
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	~~{{50%done}}~~
	This page outlines the assumptions for various '''ANOVA''' models, including [[t-test\|''t''-tests]].		This page outlines the assumptions for various '''ANOVA''' models, including [[t-test\|''t''-tests]].

wikademia>Wikademia: 17 revisions

2009-04-08T04:25:07Z

17 revisions

← Older revision	Revision as of 04:25, 8 April 2009
(No difference)

wikademia>Jtneill: /* t-tests, one-way ANOVA and factorial ANOVA */

2008-12-05T01:32:55Z

t-tests, one-way ANOVA and factorial ANOVA

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	==[[{{BASEPAGENAME}}/Testing differences\|''t''-tests]], [[{{BASEPAGENAME}}/One-way ANOVA\|one-way ANOVA]] and [[{{BASEPAGENAME}}/Factorial ANOVA\|factorial ANOVA]]==		==[[{{BASEPAGENAME}}/Testing differences\|''t''-tests]], [[{{BASEPAGENAME}}/One-way ANOVA\|one-way ANOVA]] and [[{{BASEPAGENAME}}/Factorial ANOVA\|factorial ANOVA]]==
			In addition, for between-group designs, it is assumed that:
	# The data in each cell is '''[[normality\|normally distributed]]'''.		# The data in each cell is '''[[normality\|normally distributed]]'''.
	# '''Homogeneity of variance''':		#* e.g., for a 2 by 2 factorial ANOVA with age and gender as the IVs, check the distributions of the DV for, say, younger females, older females, younger males, and older males.
			# The data in each cell has '''[[Homogeneity of variance\|homogenous variance]]''':
	#* The [[variance]] for each cell should be similar - a rule of thumb is that one ''SD'' should not be more than double another cell ''SD''.		#* The [[variance]] for each cell should be similar - a rule of thumb is that one ''SD'' should not be more than double another cell ''SD''.
	#* If violated,		#* If violated,
	#** the ''p''-values for significance tests are inaccurate.		#** the ''p''-values for significance tests are inaccurate.
	#** [[SPSS]] has ~~post-hoc~~ tests to adjust for ~~this~~.		#** [[SPSS]] has tests to adjust for hetereogeneity of variance.
	# '''Cells are independent''' - Cases represent random samples from the target populations and the scores of the test variable should be independent of each other (i.e., the scores in one cell are not dependent on the scores in another cell).		# '''Cells are independent''' - Cases represent random samples from the target populations and the scores of the test variable should be independent of each other (i.e., the scores in one cell are not dependent on the scores in another cell).
	#* Inaccurate ''p-''values are produced if the independence assumption is violated.		#* Inaccurate ''p-''values are produced if the independence assumption is violated.<noinclude>
	<noinclude>
	[[Category:{{BASEPAGENAME}}]]		[[Category:{{BASEPAGENAME}}]]
	</noinclude>		</noinclude>

wikademia>Jtneill at 01:27, 5 December 2008

2008-12-05T01:27:16Z

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	# [[Dependent variable]]s must be:		# [[Dependent variable]]s must be:
	#* Measured at interval or ratio [[level of measurement]].		#* Measured at interval or ratio [[level of measurement]].
	#* [[Normal distribution\|Normally distributed]] in all groups of the [[independent variable]].		#* [[Normal distribution\|Normally distributed]] in all groups (of the [[independent variable]]s).
	#** ANOVA is quite robust to violations of this assumption if sample sizes are large and approximately equal (> 15 cases per group)		#** ANOVA is quite robust to violations of this assumption if sample sizes are large and approximately equal (> 15 cases per group)

wikademia>Jtneill: /* All models */

2008-12-05T01:26:30Z

All models

← Older revision		Revision as of 01:26, 5 December 2008
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	==All models==		==All models==
	# [[Dependent variable]]s must be:		# [[Dependent variable]]s must be:
	#* Measured at interval or ratio ~~level~~ [[level of measurement]].		#* Measured at interval or ratio [[level of measurement]].
	#* [[Normal distribution\|Normally distributed]] in all groups of the [[independent variable]].		#* [[Normal distribution\|Normally distributed]] in all groups of the [[independent variable]].
	#** ANOVA is quite robust to violations of this assumption if sample sizes are large and approximately equal (> 15 cases per group)		#** ANOVA is quite robust to violations of this assumption if sample sizes are large and approximately equal (> 15 cases per group)

wikademia>Jtneill at 01:26, 5 December 2008

2008-12-05T01:26:13Z

← Older revision		Revision as of 01:26, 5 December 2008
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	{{50%done}}		{{50%done}}
	This page outlines ~~and summarises~~ the assumptions for various '''ANOVA''' models, including [[t-test\|''t''-tests]].		This page outlines the assumptions for various '''ANOVA''' models, including [[t-test\|''t''-tests]].

	==All models==		==All models==

wikademia>Jtneill at 01:25, 5 December 2008

2008-12-05T01:25:57Z

← Older revision		Revision as of 01:25, 5 December 2008
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	#* The [[variance]] for each cell should be similar - a rule of thumb is that one ''SD'' should not be more than double another cell ''SD''.		#* The [[variance]] for each cell should be similar - a rule of thumb is that one ''SD'' should not be more than double another cell ''SD''.
	#* If violated,		#* If violated,
	#** the ''p-''values for significance tests are inaccurate.		#** the ''p''-values for significance tests are inaccurate.
	#** [[SPSS]] has post-hoc tests to adjust for this.		#** [[SPSS]] has post-hoc tests to adjust for this.
	# '''Cells are independent''' - Cases represent random samples from the target populations and the scores of the test variable should be independent of each other (i.e., the scores in one cell are not dependent on the scores in another cell).		# '''Cells are independent''' - Cases represent random samples from the target populations and the scores of the test variable should be independent of each other (i.e., the scores in one cell are not dependent on the scores in another cell).

wikademia>Jtneill at 01:25, 5 December 2008

2008-12-05T01:25:42Z

← Older revision		Revision as of 01:25, 5 December 2008
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	{{50%done}}		{{50%done}}
	This page outlines and summarises the assumptions for various '''ANOVA''' models, including [[t-~~tests~~\|''t''-tests]].		This page outlines and summarises the assumptions for various '''ANOVA''' models, including [[t-test\|''t''-tests]].

	==All models==		==All models==