Holcombe:ProgrammingInR

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There is a wiki with some good tips [http://wiki.r-project.org/rwiki/doku.php?id=start here].
There is a wiki with some good tips [http://wiki.r-project.org/rwiki/doku.php?id=start here].
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[http://wiki.r-project.org/rwiki/doku.php?id=tips:data-frames Data frame tips]
Examining your data matrix or object, let's say it's called ''datos''
Examining your data matrix or object, let's say it's called ''datos''

Revision as of 18:01, 11 November 2009

Members

Alex Holcombe
Sarah McIntyre
Fahed Jbarah
• Shih-Yu Lo
• Patrick Goodbourn
Lizzy Nguyen
Alumni


Technical

Skills Checklist
Python Programming
Psychopy/VisionEgg Installation Notes
R analysis,plot,stats
Statistics
Buttonbox
Verifying timing
Programming Cheat Sheets


R is an interactive programming language for statistics. The syntax is very idiosyncratic, try R for programmers for a description. However it may have menu-driven versions maybe available R commander we haven't tried that and another one is pmg GTK maybe here

R_Statistics introduces you to R

R reference cheatsheet, also a file here Media:Matlab-python-xref.pdf‎ that gives equivalent code for doing array operations in MATLAB, Python, and R plot parameters

In the lab we have the book Using R for Introductory Statistics.

There is a wiki with some good tips here. Data frame tips

Examining your data matrix or object, let's say it's called datos

head(datos)
str(datos)

Don't use the function attach. It seems to leave lots of data in the 'environment' that can cause problems later. Also it makes the code harder to understand.

doing ANOVAs etc

some aov (ANOVA) explanation

R will assume factor is regressor if numeric

I think I had too many error terms reducing error terms

Dealing with circular data

von Mises vs. wrapped Gaussian,

see Swindale, N. V. (1998). Orientation tuning curves: empirical description and estimation of parameters. Biol Cybern, 78(1), 45-56.

Setting up a proxy in R on a Mac

The easiest way to set up a proxy is simply to create a file called ".Rprofile" in your user directory (~ or Users/username/) with the line:

 Sys.setenv(http_proxy=”http://username:password@tcdproxy.tcd.ie:8080″)

Then restart R. This information (and more) can be found on Ken Benoit's webpage

For Sydney Uni, use:

 Sys.setenv(http_proxy=”http://www-cache.usyd.edu.au:8080″)
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