Posted by
Ware, William B on
Jan 30, 2019; 4:10pm
URL: http://spssx-discussion.165.s1.nabble.com/ANOVA-Statistical-Significance-where-does-d-value-come-from-tp5737341p5737343.html
I would bet that it is Cohen's d... The difference between the means is approximately .59. The pooled standard deviation is a little less than 1.00, so the ratio is approximately .6 or so..
Bill
William B. Ware, Professor Emeritus
Educational Psychology, Measurement, and Evaluation
Learning Sciences and Psychological Studies
University of North Carolina at Chapel Hill
McMichael Term Professor of Education, 2011-2013
Adjunct Professor, School of Social Work
Academy of Distinguished Teaching Scholars at UNC-Chapel Hill, Charter Member
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-----Original Message-----
From: SPSSX(r) Discussion <
[hidden email]> On Behalf Of William Peck
Sent: Wednesday, January 30, 2019 11:01 AM
To:
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Subject: ANOVA Statistical Significance, where does "d" value come from?
5 months into learning SPSS / Statistics and need a hopefully quick primer on one statistic from ANOVA.
I am duplicating a report from last year, which worked great for this year's data. SPSS ran great and I got the output I expected, but need help in interpreting last year's report.
ANOVA output from last year is
Fall CALC1 grades
N Mean Std. Deviation
Class of 2020 125 2.0720 1.01740
Class of 2021 149 2.6644 .96989
Total 274 2.3942 1.03320
Fall CALC1 grades
SS df Mean Square F Sig.
Between Groups 23.857 1 23.857 24.252 .000 ***
Within Groups 267.573 272 .984
Total 291.431 273
*** The footnote on this data says "There is a statistically significant and moderately sized (d = .60) difference in Calculus I grades between 2020 and 2021. "
My question is where do you get "d = .60" (because I don't see it anywhere). If I can find that, at least I'll have a reference for the comment, then I'll study ANOVA myself and post questions as needed.
(The statistician who did last year's report is nowhere to be found ...)
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