June 2018 Member Webinar: The Fundamentals of Sample Size Calculations

by Karen Grace-Martin

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.

As tempting as it is to skip or fudge this task, it will only lead to bigger headaches later on when data collection takes forever or you discover you don’t have enough data to test your hypotheses.

So how do you actually do them, and how to do you understand the many, many issues involved?

In this month’s Stat’s Amore webinar, we will lay out the seven steps to run an accurate sample size estimate. Some of them are super easy (like #2: choose an alpha level). Others are much harder to do in practice than they look (#3: specify the smallest effect size of scientific interest).

We will also discuss some fundamental concepts that you need to really wrap your head around. They will help you understand how to approach these seven steps. And more importantly they’ll help you understand why you must avoid some of the common but bad practices that are often recommended by well-meaning advisers and what to do when you’ve hit a tricky sample-size situation.

Note: This webinar is only accessible to members of the Statistically Speaking Membership Program.

About the Instructor

Karen Grace-Martin helps statistics practitioners gain an intuitive understanding of how statistics is applied to real data in research studies.

She has guided and trained researchers through their statistical analysis for over 15 years as a statistical consultant at Cornell University and through The Analysis Factor. She has master’s degrees in both applied statistics and social psychology and is an expert in SPSS and SAS.

Not a Member Yet?

It’s never too late to join the hottest stats club around.

Just head over to our enrollment page to sign up for Statistically Speaking.

You’ll get exclusive access to this month’s webinar, plus live Q&A sessions, a private stats forum, 60+ video recordings of past webinars, and more.

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