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R is wonderful but sometimes getting things done is a pain. Here we collect code to make it more fun and get things done.

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This site is linked to the Edinburgh Psychology Statistics Seminar Group and to the MSc Statistics Course:
Univariate Statistics and Methodology using R (P03320), as well as The Differential Group Journal Club at Edinburgh.

If you are doing SEM in R, check out OpenMx, a powerful new free SEM package built on top of R.

Contents

• Beginning R
• Data Cleaning
• Frequently Asked Questions
• General R Hints
  • Data manipulation
  • Exploring your data
  • Packages
  • Power
  • Simulation
• Model Fitting
  • Contrasts
  • Exploratory Factor Analysis
  • Generalized Linear Models (GLMs)
  • Item Response Theory
  • Mixed effects models
  • Model-based clustering
  • Permutation testing
  • Structural Equation Modeling
• msc faq
• Univariate methods and statistics using R
  • Refresher in inferential statistics

• on power measures

Contribute!

If you want to help or add things, you can: just press edit. You can discuss top level planning issues here.
If you see an entry you'd like to fix then go ahead: Pages can easily be recovered if you accidentally destroy something.

Guidelines

• Just edit — if you break something then ask one of the wiki contacts for assistance.
• If you create a new page, set its parent page so it gets included in the contents (options:parent).
• Provide references
• Ensure example code is standalone.
  • Use "require" to indicate what libraries are needed.
  • Include an example of the output you get (this is especially important for graphs so you see what the code does).
• If you want a change that you are unable to do yourself, add a footnote reading "FIXME!", plus the problem.

Notes for the reader

All examples should be standalone, but it is assumed you have the required packages installed. If on running a require command you see an error like the following:

require(lme4)
Loading required package: lme4
Warning message:
In library(package, lib.loc = lib.loc, character.only = TRUE, logical.return = TRUE,  :
  there is no package called 'lme4'

that means you need to install the package. Do so by typing

install.packages("packagename", dep=T)