R is an interactive programming language for statistics. The syntax is very idiosyncratic, and not really in a good way. 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
In the lab we have the book Using R for Introductory Statistics. R_Statistics introduces you to R
Dani has posted some example code and graphs on his personal website.
Functions in R can only return one parameter. Calling typeof() on a dataframe returns "list"! Delete nearly everything in memory: rm(list = ls())
Examining your data frame or object, let's say it's called datos
head(datos) str(datos) summary(datos) #good for ggplot objects also typeof(datos)
df$varWithExtraLevels = factor(df$varWithExtraLevels)
Calling typeof() on a dataframe returns "list"
length(df) #number of columns of dataframe
names(df) #names of columns of dataframe
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.
Check your counterbalancing in your results file. Make a contingency table,
Creating Graphs (usu. ggplot2)
In the lab we usually use the package, ggplot2, for graphs. Ask Sarah about the ggplot2 book.
For custom colour schemes, the Chart of R Colors is a helpful resource. The table with named colours is most useful.
#changing axis breaks
p=p+scale_y_continuous(breaks=c(0,0.5,1),minor_breaks=c(.25,.75)) p=p+opts(title="one-behind errors")
opts(panel.grid.minor = theme_blank())+
last_plot() + opts(panel.grid.minor = theme_line(colour = "black") )
facet_grid(.~subject) # rows~columns
order used for scale mapping (color, etc.) is perhaps the order of the levels property of the vector. This gives bizarre results because R's sort(unique(x)) default does not alphabetize strings.
Debugging in R
How to examine and try things with a questionable variable within a function?
ee <<- resultsMeans #make global, violating all principles of good coding #DEBUG STOP
fitting psychometric functions
Malte Kuss hosts the R library PsychoFun on his personal webpage rather than c-ran server. So you must download is package, unzip it, and install it by inside R going to Packages&Data->Package Installer->Local Package Directory->Install, go inside the PsychoFun directory you've unzipped, and click Open.
I needed to constrain width of psychometric function to be quite narrow. Prior I was using followed lognormal distribution. Then if want mode to be say .1, have to feed it a mean parameter of -2.3 because ln(.1) = -2. Unfortunately the PsychoFun code doesn't allow using a negative parameter for that prior, so I had to change the code. To do so, you go into the downloaded version of PsychoFun folder before you install it, where you can find PsychoFun.R in the R subdirectory. I commented out line 56. Then have to reinstall with Package Installer inside R, "Local Package Directory" option, after in my case first deleting original PsychoFun installation in /Library/Frameworks/R.framework/Versions/2.10/Resources/library/
Technical Report explains many more terms than JoV article: Acceptance rate:Next sample in chain only accepted if quantity on p.481 of JoV paper is good Kinetic, Potential energy from Hamiltonian algorithm
doing ANOVAs etc
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:
Then restart R. This information (and more) can be found on Ken Benoit's webpage
For Sydney Uni, use: