Levene's p versus the test statistic p - Revision history

Admin at 14:37, 20 April 2022

2022-04-20T14:37:19Z

Ldaigle at 22:21, 5 March 2022

2022-03-05T22:21:47Z

Admin at 22:09, 4 November 2019

2019-11-04T22:09:55Z

Admin at 22:09, 4 November 2019

2019-11-04T22:09:09Z

Strungadi at 14:46, 18 October 2019

2019-10-18T14:46:30Z

Admin: Created page with "Levene's p versus the test statistic p When an  value is set at .05, any p that is smaller than .05 is producing a statistically significant different result, while any va..."

2019-08-29T00:22:45Z

Created page with "Levene's p versus the test statistic p When an  value is set at .05, any p that is smaller than .05 is producing a statistically significant different result, while any va..."

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Levene's p versus the test statistic p

When an  value is set at .05, any p that is smaller than .05 is producing a statistically significant different result, while any value greater than .05 is producing a statistically similar result.

p≤.05  statistical difference

p>.05  statistical similarity

When do we want one or the other? It depends on the question asked.

For example, when we are looking at two sets of data to see if they are homogenous to one another for the purpose of equal variances, we want p>.05 so there IS statistical similarity. Therefore the Levene’s test demonstrates homogeneity (equal variance) when p>.05. (This generally results in an F≈1.) When Levene’s is statistically similar this is a GOOD thing, because it gives us confidence that data sets have similar distributions (even though their means might be different). In other words, the curves look similar, even though their centers might be at different points on the number line.

On a t test, you are generally trying to show a difference (although not always the case). Therefore the p≤.05. If p≤.05 then we know that tcrit<tstat. If p>.05, then tcrit>tstat.

''contributed by Frank LaBanca, EdD''

This is a great visual for 'significantly different and similar'.

[[File:Statistics.JPG|200px|thumb|left|alt text]]

''contributed by John Ryan'' Drawing by Frank LaBanca, EdD

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-== Levene's in SPSS ==
+== Calculating the Levene's test for a t-test in SPSS ==
-On SPSS, go to Analyze then Compare Means. Click on Independent Samples T test. Then, choose the variable you are testing and choose the group variable. Click on definite groups and use the numbers that correlates with the two groups you are comparing. Then, you will have your Levene's p value. If the Levene's test is greater than .05, use the top row of statistics. If it is less than .05, use the bottom row of statistics.
+On SPSS, go to Analyze then Compare Means. Click on Independent Samples T test. Then, choose the variable you are testing and choose the group variable. Click on definite groups and use the numbers that correlates with the two groups you are comparing. Then, you will have your Levene's p value. If the Levene's test is greater than .05, use the top row of statistics. If it is less than or equal to .05, use the bottom row of statistics.
-''Contributed by Lisa Daigle''
+''contributed by Lisa Daigle''

← Older revision		Revision as of 22:21, 5 March 2022
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	''contributed by Scott Trungadi''		''contributed by Scott Trungadi''
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		+
		+	== Levene's in SPSS ==
		+
		+	On SPSS, go to Analyze then Compare Means. Click on Independent Samples T test. Then, choose the variable you are testing and choose the group variable. Click on definite groups and use the numbers that correlates with the two groups you are comparing. Then, you will have your Levene's p value. If the Levene's test is greater than .05, use the top row of statistics. If it is less than .05, use the bottom row of statistics.
		+
		+	''Contributed by Lisa Daigle''

← Older revision		Revision as of 22:09, 4 November 2019
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−	''contributed by John Ryan'' ~~Drawing~~ by Frank LaBanca, EdD	+	''contributed by John Ryan''
		+	''drawing by Frank LaBanca, EdD''

← Older revision		Revision as of 22:09, 4 November 2019
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	[https://youtu.be/4mkEZxgxMRA Levene’s Test of Homogeneity of Variance in SPSS]		[https://youtu.be/4mkEZxgxMRA Levene’s Test of Homogeneity of Variance in SPSS]

−	contributed by Scott Trungadi	+	''contributed by Scott Trungadi''

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 Levene's p versus the test statistic p
 When an  value is set at .05, any p that is smaller than .05 is producing a statistically significant different result, while any value greater than .05 is producing a statistically similar result.
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 ''contributed by John Ryan'' Drawing by Frank LaBanca, EdD
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