Articles by Richard Morey

Numerical pitfalls in computing variance

May 3, 2016 | Richard Morey

One of the most common tasks in statistical computing is computation of sample variance. This would seem to be straightforward; there are a number of algebraically equivalent ways of representing the sum of squares \(S\), such as \[ S = \sum_{k=1}^n ( x_k - \bar{x})^2 \] or \[ S = \sum_{k=1}^... [Read more...]

Numerical pitfalls in computing variance

May 3, 2016 | Richard Morey

One of the most common tasks in statistical computing is computation of sample variance. This would seem to be straightforward; there are a number of algebraically equivalent ways of representing the sum of squares (S), such as [ S = sum_{k=1}^n ( x_k - bar{x})^2 ] or [ S = sum_{k=1}^... [Read more...]

How to check Likert scale summaries for plausibility

March 30, 2016 | Richard Morey

Suppose you are reading a paper that uses Likert scale responses. The paper reports the mean, standard deviation, and number of responses. If we are -- for some reason -- suspicious of a paper, we might ask, "Are these summary statistics possible for this number of responses, for this Likert ... [Read more...]

On radical manuscript openness

August 10, 2015 | Richard Morey

One of my papers that has attracted a lot of attention lately is "The Fallacy of Placing Confidence in Confidence Intervals," in which we describe some of the fallacies held by the proponents and users of confidence intervals. This paper has been discussed on twitter, reddit, on blogs (eg, here ... [Read more...]

On radical manuscript openness

August 10, 2015 | Richard Morey

One of my papers that has attracted a lot of attention lately is "The Fallacy of Placing Confidence in Confidence Intervals," in which we describe some of the fallacies held by the proponents and users of confidence intervals. This paper has been discussed on twitter, reddit, on blogs (eg, here ... [Read more...]

The frequentist case against the significance test, part 2

March 9, 2015 | Richard Morey

The significance test is perhaps the most used statistical procedure in the world, though has never been without its detractors. This is the second of two posts exploring Neyman's frequentist arguments against the significance test; if you have not read Part 1, you should do so before continuing (“The frequentist case ... [Read more...]

At the APS Observer: a profile of JASP

March 2, 2015 | Richard Morey

The APS Observer has just published a profile of JASP, a graphical user interface designed to make statistics easier. It includes Bayesian procedures by means of the R and the BayesFactor package. From the article: JASP distinguishes itself from S... [Read more...]

BayesFactorExtras: a sneak preview

February 10, 2015 | Richard Morey

Felix Schönbrodt and I have been working on an R package called BayesFactorExtras. This package is designed to work with the BayesFactor package, providing features beyond the core BayesFactor functionality. Currently in the package are:Sequential Bayes factor plots for visualization of how the Bayes factor changes as data ... [Read more...]

On making a Bayesian omelet

February 7, 2015 | Richard Morey

My colleagues Eric-Jan Wagenmakers and Jeff Rouder and I have a new manuscript in which we respond to Hoijtink, van Kooten, and Hulsker's in press manuscript Why Bayesian Psychologists Should Change the Way they Use the Bayes Factor. They suggest a method for "calibrating" Bayes factor using error rates. We ... [Read more...]

Multiple Comparisons with BayesFactor, Part 1

January 17, 2015 | Richard Morey

On of the most frequently asked questions about the BayesFactor package is how to do multiple comparisons; that is, given that some effect exists across factor levels or means, how can we test whether two specific effects are unequal. In the next two posts, I'll explain how this can be ... [Read more...]
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