In the last part of Page‘s R course we will continue learning about LMEMs by using contrast coding and model comparison. We will also extended our use of inline R code in an R Markdown document.
It has been a while, but we’re happy to present the last two parts of Page’s R course. In this lesson we will learn how to run a LMEM (linear mixed effects model). We will also introduce the packages RColorBrewer and lme4, and as always expanded your knowledge of dplyr and ggplot2 calls.
One argument that often comes up when I talk to skeptics of preregistration is that it stands in the way of creative and exciting research. I couldn’t disagree more. Preregistration and registered reports are among the very best developments that have come out of Psychology’s replication crisis. Both guide a way towards better research. But since the sentiment that preregistration and creativity are not compatible is so prevalent and seems so genuine (as opposed to being an excuse to engage in questionable research practices), I do want to expand on some main reasons why preregistration does not dampen creativity in research. Continue reading Why we don’t need to be afraid that preregistration prevents creativity
I spent four years writing my thesis, four years of ups and downs, p values smaller than .05, but also some t values smaller than .05. At times, I felt confident and optimistic, at times less so – this was somewhat correlated with the p values, but not significantly so.
Then it came time to start gathering everything I did into an article thesis. In the Hebrew University, at least in my year, not all of these articles had to be published articles, and you could also include manuscripts you did not plan to submit for publication. I thought I would write up everything, even my null results, because whoever reads my dissertation (well, at least all those 1st year PhD students and my grandfather) could probably learn just as much from my failed attempts than from my success stories. Continue reading The only real mistake is the one from which we learn nothing
Christina, Page and I like meta-analyses. We are convinced they are a great tool to leverage past research in order to move forward: To gain an overview of the state of a field, to get an idea of research practices, to plan new experiments, and even to get novel theoretical insights.
Stephen Politzer-Ahles is Assistant Professor at the Department of Chinese and Bilingual Studies of The Hong Kong Polytechnic University. He is committed to finding solutions to current challenges in the cognitive sciences. For instance, he is developing efficient and transparent strategies to empty out his own file drawer.
p>.05. We’ve all been there. Who among us hasn’t had a student crying in our office over an experiment that failed to show a significant effect? Who among us hasn’t been that student?
Statistical nonsignificance is one of the most serious challenges facing science. When experiments aren’t p<.05, they can’t be published (because the results aren’t real), people can’t graduate, no one can get university funding to party it up at that conference in that scenic location, and in general the whole enterprise falls apart. The amount of taxpayer dollars that have been wasted on p>.05 experiments is frankly astounding. Continue reading Find a significant effect in any study
The new year is here, and many of us start off with some resolutions. Following this trend, I thought it would be fun to share some things I’ve been doing and will continue to do that mostly (with the exception of point 3) require only little effort on my side and which positively impact my sciencing and that of those around me. Continue reading 7 small things you can do for science in 2017
Today we’ll learn how to run an ANOVA. We also use the packages tidyr and ez to modify a data frame’s format and run ANOVAs of different types, and as always expanded our knowledge of dplyr and ggplot2 calls.
Recently, we (that is Page and Christina) successfully launched the Parisian installation of R-Ladies Global. It’s a meetup group and at the same time a non-profit coding club for all R proficiency levels, whether you’re a new or aspiring R user, or an experienced R programmer interested in mentoring, networking, and maybe picking up some new skills. We are a community designed to encourage, support and ultimately drive the development of our own R skills through a range of events, including meetups where members tackle hands-on tutorials and exercises to learn specific functionalities, informal gatherings, talks about latest trends, and debates. Our goal is to promote access to STEM (Science, Technology, Engineering, Mathematics) careers and tools for women (trans and cis) and gender-variant people. Men are welcome, too, by the way. We just need a member to bring them to the next meetup. In other words, we try to be a harassment-free zone. Sadly, that’s easier to do when men are screened beforehand.
Today we’ll learn how to take an old statistics test (logistic regression) but expand it to when you have two variables (multiple regression). The package purrr is introduced and, as always, we’ll expand our knowledge of dplyr and ggplot2.
For full materials, see the course website for Lesson 4.