349 search results for "ANOVA"

An R Enthusiast Goes Pythonic!

May 28, 2015
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An R Enthusiast Goes Pythonic!

I’ve spent so many years using and broadcasting my love for R and using Python quite minimally. Having read recently about machine learning in Python, I decided to take on a fun little ML project using Python from start to … Continue reading →

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Simulation-based power analysis using proportional odds logistic regression

May 22, 2015
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Simulation-based power analysis using proportional odds logistic regression

Consider planning a clinicial trial where patients are randomized in permuted blocks of size four to either a 'control' or 'treatment' group. The outcome is measured on an 11-point ordinal scale (e.g., the numerical rating scale for pain). It may be reasonable to evaluate the results of this trial using a proportional odds cumulative logit

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The perfect t-test

May 18, 2015
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The perfect t-test

I've created an easy to use R script that will import your data, and performs and writes up a state-of-the-art dependent or independent t-test. The goal of this script is to examine whether more researcher-centered statistical tools (i.e., a one-click analysis script that checks normality assumptions, calculates effect sizes and their confidence intervals, creates good figures,...

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Using R and lme/lmer to fit different two- and three-level longitudinal models

April 21, 2015
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Using R and lme/lmer to fit different two- and three-level longitudinal models

I often get asked how to fit different multilevel models (or individual growth models, hierarchical linear models or linear mixed-models, etc.) in R. In this guide I have compiled some of the more common and/or useful models (at least common in clinical psychology), and how to fit them using nlme::lme() and lme4::lmer(). I will cover the common two-level random...

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Tips & Tricks 8: Examining Replicate Error

April 4, 2015
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Geomorph users,When starting out in a geometric morphometrics study, the common questions are ones of repeatability and measurement error.How much of the variation in the Procrustes residuals is due to human (digitizing) error? How much is du...

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Recruitment Chapter for IFAR

April 2, 2015
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Recruitment Chapter for IFAR

I have added a very rough draft of the Recruitment chapter to the Introduction to Fisheries Analysis with R (IFAR) page.  This chapter is a complete re-working of the old Stock-Recruitment vignette and includes a section on fitting non-linear stock-recruitment … Continue reading →

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Student Performance Indicators

March 31, 2015
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Student Performance Indicators

Check out my: Portfolio Site Github LinkedIn Source: http://archive.ics.uci.edu/ml/datasets/Student+Performance This project is based upon two datasets of the academic performance of Portuguese students in two different

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Geomorph and Multivariate Datasets

March 25, 2015
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Did you know that geomorph is not just for landmark-based geometric morphometric (shape) data?We are committed to providing statistical tools for multivariate AND multidimensional morphometric data.As laid out in the recent series of papers on Phylogenetic Comparative Methods for high-dimensional data (Adams 2014a, Adams 2014b, Adams 2014c, Adams & Felice 2014), harnessing the R-mode – Q-mode equivalency as first shown...

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Regression Models, It’s Not Only About Interpretation

March 22, 2015
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Regression Models, It’s Not Only About Interpretation

Yesterday, I did upload a post where I tried to show that “standard” regression models where not performing bad. At least if you include splines (multivariate splines) to take into accound joint effects, and nonlinearities. So far, I do not discuss the possible high number of features (but with boostrap procedures, it is possible to assess something related to...

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At the APS Observer: a profile of JASP

March 2, 2015
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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...

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