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Monty Hall Simulations
The Monty Hall ProblemThere've been many simulations of the Monty Hall-problem done in R. But since I'm trying to learn R, I wanted to try to simulate the paradox over many different trails and plot...
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Using Ggplot2 to plot last.fm top 100 albums
I found out that last.fm had made data files available for their Best of 2011 artist list, and I thought it’d be a great opportunity to learn some more about data management in R and Ggplot2. I began...
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Ggplot2, PubMed citation frequency and DSM-IV Axis I disorders by year
IntroductionI an earlier post I used ggplot2 to plot publication count by year for different psychotherapy orientations. I'm using an updated version of that R-code in this post to plot publication...
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Simple data mining and plotting data on a map with ggplot2
IntroductionA Facebook group for psychologists in Sweden created a document where each member could type in were they live and what they work with. At the moment 192 psychologists have added their...
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Does mindfulness aid insight problem solving? New study suggest so
A new study (Ostafin, B. D., & Kassman, K. T, In Press) examined whether mindfulness meditation could help improve participants' insight problem solving skills. Their hypothesis was that...
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How to work with Google n-gram data sets in R using MySQL
IntroductionGoogle Ngram is a corpus of n-grams compiled from data from Google Books. Here I’m going to show how to analyze individual word counts from Google 1-grams in R using MySQL. I’ve also...
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Mindfulness and pain: new research review hints at unique mechanism for pain...
IntroductionEven though the effectiveness of mindfulness to reduce pain has been proven in numerous empirical studies its efficacy still remain unclear. Meaning that the effectiveness of mindfulness...
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The (Un)disputed Champion of Psychotherapy – Clinical psychologists and their...
Clinical Psychologists Theoretical Orientations 1960–2010A recent study by Norcross & Karpiak (2012) looked at survey data from members of APA Division 12 (Society of Clinical Psychology). In their...
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An R Script to Automatically download PubMed Citation Counts By Year of...
BackgroundI believe there’s some information to be gained from looking at publication trends over time. But it’s really troublesome to do it by hand; fortunately it’s not so troublesome to do it in R...
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Meditation, mindfulness, and executive control: results from a new EEG study
IntroductionIt's not really surprising that meditation might aid in executive control, since the act of meditation is basically an exercise in executive control. Take mindfulness, for example, I would...
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Short R script to plot effect sizes (Cohen's d) and shade overlapping area
Update: I have created an interactive effect size visualization hereIntroduction to effect sizesMany times you read in a study that “x and y were significantly different, p< .05”, which is another...
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Further evidence that mindfulness meditation might bolster creativity
IntroductionI recently wrote an article about if mindfulness could aid in insight problem solving. The problem with the study, I referenced to in my article, was that it did not strictly investigate...
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More PubMed data mining: looking at top 20 CBT journals
IntroductionContinuing from what I wrote in my article An R Script to Automatically download PubMed Citation Counts By Year of Publication, I’ve now looked at article counts for journals. I did this by...
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How to download complete XML records from PubMed and extract data
IntroductionMy first PubMed script (An R Script to Automatically download PubMed Citation Counts By Year of Publication) extracted yearly counts for any number of search strings, by using PubMed’s...
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PubMed publications in 2011 by 202 world countries: who’s the winner?
IntroductionI had this idea that it’d be fun to look at all PubMed's articles from 2011 and extract country affiliation for each individual country. So I set out to do just that, but in addition to...
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Effect of sample size on the accuracy of Cohen's d estimates (95 % CI)
IntroductionI've been incredibly busy the last month, amongst other things I've moved about 400 miles from Umeå, in the north of sweden, to Stockholm. However, I've been working a lot with R and...
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The Higgs boson: 5-sigma and the concept of p-values
Today’s announcement at CERN of the latest research on the Higgs boson was truly extraordinary. Not only was the scientific achievement remarkable, but medias reporting of 5-sigma as a measure of...
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How to tell when error bars correspond to a significant p-value
IntroductionBelia, Fidler, Williams, and Cumming (2005) found that researchers in psychology, behavior neuroscience and medicine are really bad at interpreting when error bars signify that two means...
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Cognitive behavioral therapy outperformed psychodynamic therapy on all...
The dodo bird might be extinct in the real world but in the world of psychotherapy research it refuses to die. However, a group of German researchers recently put forward an article were they had...
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Analytical and simulation-based power analyses for mixed-design ANOVAs
In this post I show some R-examples on how to perform power analyses for mixed-design ANOVAs. The first example is analytical — adapted from formulas used in G*Power (Faul et al., 2007), and the second...
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