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Daniel Lakens
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135 followers
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Always use Welch's t-test instead of Student's t-test
See our paper on this topic: Delacre, M., Lakens, D., & Leys, C. (in press). Why psychologists should by default use Welch’s t -test instead of Student’s t -test. International Review of Social Psychology . Pre-Print . Take home
message of this post: We sho...

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ROPE and Equivalence Testing: Practically Equivalent?
In a previous
post , I compared equivalence tests to Bayes factors, and pointed out
several benefits of equivalence tests. But a much more logical comparison, and
one I did not give enough attention to so far, is the ROPE procedure using
Bayesian estimation...

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Examining Non-Significant Results with Bayes Factors and Equivalence Tests

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Examining Non-Significant Results with Bayes Factors and Equivalence Tests
In this blog, I’ll
compare two ways of interpreting non-significant effects: Bayes factors and TOST
equivalence tests. I’ll explain why reporting more than only Bayes factors
makes sense, and highlight some benefits of equivalence testing over Bayes
factors...

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Why Type 1 errors are more important than Type 2 errors (if you care about evidence)
After performing a study, you can correctly conclude there
is an effect or not, but you can also incorrectly conclude there is an effect
(a false positive, alpha, or Type 1 error) or incorrectly conclude there is no
effect (a false negative, beta, or Type 2...

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TOST equivalence testing R package (TOSTER) and spreadsheet
I’m happy to announce my first R package ‘TOSTER’ for
equivalence tests (but don’t worry, there is an old-fashioned spreadsheet as
well). In an earlier blog post I talked about equivalence tests. Sometimes
you perform a study where you might expect the effe...

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Why Within-Subject Designs Require Less Participants than Between-Subject Designs
One widely recommended approach to increase power is using a
within subject design. Indeed, you need less participants to detect a mean difference
between two conditions in a within-subjects design (in a dependent t -test) than in a between-subjects
design ...

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Improving Your Statistical Inferences Coursera course
I’m really excited to be able to announce my “ Improving Your Statistical Inferences ” Coursera course. It’s a free massive open online course
(MOOC) consisting of 22 videos, 10 assignments, 7 weekly exams, and a final
exam. All course materials are freely ...
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