Category: Replication

We’ve Been Here Before: The Replication Crisis over the Pygmalion Effect

[UPDATE: Thanks to twitter I came across this marvelous book(Jussim, 2012) that does a great job explaining the Pygmalion effect, the controversy around it, and the overall state of research on expectancy effects.  I’ve amended parts of this post based on

Measuring Heterogeneity in Meta-Analysis: The Diamond Ratio (DR)

This is a post about the Diamond Ratio (DR), a simple measure of the extent of heterogeneity in a meta-analysis. We introduced the DR in ITNS. But first, some background. Fixed Effect (FE) model for meta-analysis The diamond at the

Sample-size planning – a short video

Here’s a short talk I gave at the 2017 Society for Neuroscience meeting on sample size planning.  The talk discusses: Why you should plan your sample sizes in advance What not to do (how some common approaches can lead you

Open Science: This Time in Orthodontics

Last month it was the Antarctic Scientists, this month the Orthodontists, and once again I had a most enjoyable time. Lindsay my wife and I are just back from 5 days in Sydney. I was speaking at the 26th Australian

The complexity of measuring a ‘simple’ behavior (novelty preference tests seem terrible)

The replication crisis isn’t just about sample size and statistical inference.  Another key issue is measurement: the process of turning observations into quantitative statements about our sample.  It’s tricky.  In many cases we’ve run before we learned to walk, adopting methods

Pre-Print – The New Statistics for Better Science

We have a new preprint on how the New Statistics can save the world (sort of):  It’s for a special issue of the American Statistician on the them of  “Beyond p values”. We welcome your feedback on via email, twitter (@TheNewStats),

Not replicable, but citable

What happens to the reputation of a paper when the results reported cannot be replicated? Here’s a graph of citations/year from two studies–an original and a replication study that found little to no effect.  It’s just one example, but it

It’s not all bad news

Here’s a cool pre-print examining the quality of evidence in studies of the genetics of short-term memory in fruit flies (Tumkaya, Ott, & Claridge-Chang, 2018).  The paper conducts a meta-analysis of different genes that have been linked to altered olfactory

Pre-registration challenge met!

I (Bob) have met the pre-registration challenge!  I pre-registered a set of replication studies (Calin-Jageman, 2018), and now that they are published, I’ve received confirmation from the Center for Open Science that I have met the challenge–a check for $1,000

Say It in Song: Go Forth and Replicate!

Jon Grahe, of Pacific Lutheran University, is an enthusiastic advocate for Open Science and, especially, for student participation in doing Open Science as a key part of education. The Collaborative Replication and Education Project (CREP, pronounced “krape”) is a great