When calculating Cohen's D for the upper and lower CLs, should we use the corresponding upper and lower CL for the Std Dev or do we always use the mean std dev?
You always use then the "mean" actual std deviation.
In the 2009 honours test, question 2c asks us to calculate effect size for all 3 pairwise comparisons. I'm not certain what this is referring to as aren't there 6 possible pairwise comparisons?
The KS is more strictly a test of normality. The Null hypothesis is that the distribution is normal. As such we would ideally prefer to fail to reject the null hypothesis. The KS is not part of the test.
Am I correct in saing that for a 1 way ANOVA the R-square value is the global effect size? Also in a 1 way ANOVA, to caluclate the effect size for each pairwise comparison do we use the formula xbar1 minus xbar2 divided by the Root MSE?
I Have received this question
ReplyDeleteWhen calculating Cohen's D for the upper and lower CLs, should we use the corresponding upper and lower CL for the Std Dev or do we always use the mean std dev?
You always use then the "mean" actual std deviation.
In the 2009 honours test, question 2c asks us to calculate effect size for all 3 pairwise comparisons. I'm not certain what this is referring to as aren't there 6 possible pairwise comparisons?
ReplyDeleteIn a Kolmorgorov-Smirnov test for skewness, which indicates that the distribution is normal - rejecting or failing to reject the null hypothesis?
ReplyDeleteThe KS is more strictly a test of normality. The Null hypothesis is that the distribution is normal. As such we would ideally prefer to fail to reject the null hypothesis. The KS is not part of the test.
ReplyDeleteAm I correct in saing that for a 1 way ANOVA the R-square value is the global effect size?
ReplyDeleteAlso in a 1 way ANOVA, to caluclate the effect size for each pairwise comparison do we use the formula xbar1 minus xbar2 divided by the Root MSE?
Yes- R-Square = Eta Squared = Global Effect Size in 1 way anova = SS_Between/SS_Total
ReplyDeleteCorrect
D = (xbar1 - xbar2)
_______________
RootMse