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effect size statistics

Odds Ratio: Standardized or Unstandardized Effect Size?

by Karen Grace-Martin Leave a Comment

Effect size statistics are extremely important for interpreting statistical results. The emphasis on reporting them has been a great development over the past decade. [Read more…] about Odds Ratio: Standardized or Unstandardized Effect Size?

Tagged With: effect size statistics, odds ratio, standardized effect size, unstandardized

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  • Effect Size Statistics: How to Calculate the Odds Ratio from a Chi-Square Cross-tabulation Table

Effect Size Statistics: How to Calculate the Odds Ratio from a Chi-Square Cross-tabulation Table

by Karen Grace-Martin Leave a Comment

Lest you believe that odds ratios are merely the domain of logistic regression, I’m here to tell you it’s not true.

One of the simplest ways to calculate an odds ratio is from a cross tabulation table.

We usually analyze these tables with a categorical statistical test. There are a few options, depending on the sample size and the design, but common ones are Chi-Square test of independence or homogeneity, or a Fisher’s exact test.

[Read more…] about Effect Size Statistics: How to Calculate the Odds Ratio from a Chi-Square Cross-tabulation Table

Tagged With: chi-square test, Crosstabulation, effect size statistics, odds ratio, probability

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  • Odds Ratio: Standardized or Unstandardized Effect Size?
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Member Training: Interpretation of Effect Size Statistics

by guest contributer

Effect size statistics are required by most journals and committees these days ⁠— for good reason. 

They communicate just how big the effects are in your statistical results ⁠— something p-values can’t do.

But they’re only useful if you can choose the most appropriate one and if you can interpret it.

This can be hard in even simple statistical tests. But once you get into  complicated models, it’s a whole new story. [Read more…] about Member Training: Interpretation of Effect Size Statistics

Tagged With: Cohen's d, Correlation, correlation indexes, effect size, effect size statistics, empirically derived, Glass, Hedges, interpreting, null hypothesis, probability of superiority, Proportion, strength association, superiority, variance

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Two Types of Effect Size Statistic: Standardized and Unstandardized

by Karen Grace-Martin Leave a Comment

Effect size statistics are all the rage these days.

Journal editors are demanding them. Committees won’t pass dissertations without them.

But the reason to compute them is not just that someone wants them — they can truly help you understand your data analysis.

What Is an Effect Size Statistic?

When many of us hear “Effect Size Statistic,” we immediately think we need one of a few statistics: Eta-squared, Cohen’s d, R-squared.
And yes, these definitely qualify. But the concept of an effect size statistic is actually much broader. Here’s a description from a nice article on effect size statistics:

“… information about the magnitude and direction of the difference between two groups or the relationship between two variables.”

– Joseph A. Durlak, “How to Select, Calculate, and Interpret Effect Sizes”

If you think about it, many familiar statistics fit this description. Regression coefficients give information about the magnitude and direction of the relationship between two variables. So do correlation coefficients. [Read more…] about Two Types of Effect Size Statistic: Standardized and Unstandardized

Tagged With: Cohen's d, effect size statistics, Eta Squared, power calculation, R-squared, sample size estimates

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Member Training: An Overview of Effect Size Statistics and Why They are So Important

by Karen Grace-Martin Leave a Comment

Whenever we run an analysis of variance or run a regression one of the first things we do is look at the p-value of our predictor variables to determine whether

they are statistically significant. When the variable is statistically significant, did you ever stop and ask yourself how significant it is? [Read more…] about Member Training: An Overview of Effect Size Statistics and Why They are So Important

Tagged With: effect size, effect size statistics, statistical significance

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Effect Size Statistics in Logistic Regression

by Karen Grace-Martin 7 Comments

Effect size statistics are expected by many journal editors these days.

If you’re running an ANOVA, t-test, or linear regression model, it’s pretty straightforward which ones to report.

Things get trickier, though, once you venture into other types of models. [Read more...] about Effect Size Statistics in Logistic Regression

Tagged With: effect size, effect size statistics, logistic regression, odds ratio

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