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effect size

Member Training: Heterogeneity in Meta-analysis

by TAF Support

Meta-analysis allows us to synthesize the results of separate studies. The goal is to assess the mean effect size and also heterogeneity – how much the effect size varies across studies.  [Read more…] about Member Training: Heterogeneity in Meta-analysis

Tagged With: effect size, heterogeneity, meta-analysis, prediction interval

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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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Your Questions Answered from the Interpreting Regression Coefficients Webinar

by Karen Grace-Martin Leave a Comment

Last week I had the pleasure of teaching a webinar on Interpreting Regression Coefficients. We walked through the output of a somewhat tricky regression model—it included two dummy-coded categorical variables, a covariate, and a few interactions.

As always seems to happen, our audience asked an amazing number of great questions. (Seriously, I’ve had multiple guest instructors compliment me on our audience and their thoughtful questions.)

We had so many that although I spent about 40 minutes answering [Read more…] about Your Questions Answered from the Interpreting Regression Coefficients Webinar

Tagged With: dummy coding, dummy variable, effect size, eta-square, Interpreting Interactions, interpreting regression coefficients, Reference Group, spotlight analysis, statistical significance

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Member Training: Meta-analysis

by guest contributer Leave a Comment

Meta-analysis is the quantitative pooling of data from multiple studies. Meta-analysis done well has many strengths, including statistical power, precision in effect size estimates, and providing a summary of individual studies.

But not all meta-analyses are done well. The three threats to the validity of a meta-analytic finding are heterogeneity of study results, publication bias, and poor individual study quality.

[Read more…] about Member Training: Meta-analysis

Tagged With: effect size, fixed effect, meta-analysis, PRISMA guidelines, random effect

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Member Training: Power Analysis and Sample Size Determination Using Simulation

by guest contributer Leave a Comment

This webinar will show you strategies and steps for using simulations to estimate sample size and power. You will learn:
  • A review of basic concepts of statistical power and effect size
  • A simulation-based approach to power analysis
  • An overview of how to implement simulations in various popular software programs.
[Read more…] about Member Training: Power Analysis and Sample Size Determination Using Simulation

Tagged With: ANOVA, effect size, mediation, mixed model, Path Analysis, Power Analysis, quantitative research, sample size, simulation

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Member Training: The Fundamentals of Sample Size Calculations

by Karen Grace-Martin 3 Comments

Sample size estimates are one of those data analysis tasks that look straightforward, but once you try to do one, make you want to bang your head against the computer in frustration. Or, maybe that’s just me.

Regardless of how they make you feel, they are super important to do for your study before you collect the data.

[Read more…] about Member Training: The Fundamentals of Sample Size Calculations

Tagged With: accuracy, data collection, effect size, sample size, sample size estimates, scientific interest, testing

Related Posts

  • Member Training: Power Analysis and Sample Size Determination Using Simulation
  • Member Training: Statistical Rules of Thumb: Essential Practices or Urban Myths?
  • Member Training: Interpretation of Effect Size Statistics
  • Member Training: Adjustments for Multiple Testing: When and How to Handle Multiplicity

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