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standardized effect size

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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Sample Size Estimation Without Past Reliable Pilot Data or Evidence

by Karen Grace-Martin 1 Comment

Here’s a common situation.

Your grant application or committee requires sample size estimates.  It’s not the calculations that are hard (though they can be), it’s getting the information to fill into the calculations.

Every article you read on it says you need to either use pilot data or another similar study as a basis for the values to enter into the software.

You have neither.

No similar studies have ever used the scale you’re using for the dependent variable.

And while you’d love to run a pilot study, it’s just not possible.  There are too many practical constraints — time, money, distance, ethics.

What do you do?

[Read more…] about Sample Size Estimation Without Past Reliable Pilot Data or Evidence

Tagged With: effect size, Power Analysis, sample size estimates, standardized effect size

Related Posts

  • Member Training: Power Analysis and Sample Size Determination Using Simulation
  • Member Training: The Fundamentals of Sample Size Calculations
  • Two Types of Effect Size Statistic: Standardized and Unstandardized
  • The Effect Size: The Most Difficult Step in Calculating Sample Size Estimates

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