# Mathematics

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### Computing Intraclass Correlations (ICC) as Estimates of Interrater Reliability in SPSS

Intraclass correlation (ICC) is one of the most commonly misused indicators of interrater reliability, but a simple step-by-step process will get it right.  In this article, I provide a brief revie...

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### Finding mixed cases in exploratory factor analysis

Abstract Two methods are presented that allow for identification of mixed cases in the extraction of general factors. Simulated data is used to illustrate them. Introduction General factors can be ...

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### Binomial calculator based on continuous hypothesis testing: there is no such a thing as a discrete hypothesis.

We present R code to compute the posterior probability based on continuous (instead of traditionally discrete) hypotheses (intervals), when the point-hypotheses have equal probabilities because ...

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### Are all significance tests made of the same stuff?

No! If you are like most of the sane researchers out there, you don't spend your days and nights worrying about the nuances of different statistical concepts. Especially ones as traditional as thes...

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### Automatic testing of all possible multiple regression models given a set of predictors

Abstract Researcher choice in reporting of regression models allow for questionable research practices. Here I present a function for R that reports all possible regression models given a set of pr...

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### Correlations and likert scales: What is the bias?

A person on ResearchGate asked the following question: How can I correlate ordinal variables (attitude Likert scale) with continuous ratio data (years of experience)? Currently, I am working on my ...

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### Using Bayes Factors to Get the Most out of Linear Regression: A Practical Guide Using R

This guide is for readers who want to make rich inferences from their data. It does not contain anything new with regard to R code or theoretical development, but it does piece together informati...

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