Monthly Archives: October 2009

Simple R figures

October 29, 2009
By
Simple R figures

http://www.harding.edu/fmccown/R/This comes very handy.

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Kicking Ass with plyr

October 29, 2009
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Kicking Ass with plyr

Tonight (October 29, 2009) at 5:30 PM is the Chicago R meetup at Jaks tap. Here’s more info.  I’ll be making a presentation based on my earlier blog post about plyr. The presentation will only be 8 minutes long so I’ve had to pick and choose my info carefully. OK, who am I kidding? I

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Go long on close and sell on open

October 29, 2009
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Go long on close and sell on open

I found a description of supposed to be profitable strategy on Bloomberg. The strategy is simple – buy S&P500 index on close and sell it on next day open. So, I tested this claim and got nice P/L curve: Yes, since 1993 this strategy has generated the profit >300%. But, neither commissions or slippage are included:) Let’s

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Bioconductor 2.5 is out

October 29, 2009
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Bioconductor 2.5 is out

For all bioinformaticians and R users out there: the Bioconductor project  for the analysis and comprehension of genomic data is out! A lot of interesting new stuff! See the full announcement here.

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Tips for Using StatET and Eclipse for Data Analysis in R

October 29, 2009
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Tips for Using StatET and Eclipse for Data Analysis in R

My favourite editor for conducting analysis in R is the StatET plug-in for Eclipse. This post discusses an assortment of tips and tricks that I've discovered to make this editing environment even better.SearchSearch (Control + H): I maintain projects i...

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Using the “foreign” package for data conversion

October 27, 2009
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Using the “foreign” package for data conversion

I was in a rush to convert a SPSS data into Stata format. Somehow my Stattransfer v.8 for Linux was lost and I did not want pause my work and go back to Windows just to get this one file converted. So fire Emacs+ESS+R, load the "foreign" package, did t...

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Literate programming, etc.

October 27, 2009
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Literate programming, etc.

http://biostat.mc.vanderbilt.edu/wiki/Main/StatReport

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MultBar : Advanced multiple barplot with SEM

October 26, 2009
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MultBar : Advanced multiple barplot with SEM

Producing this kind of graphs (below) in R can be a pain in the a*s. Here is a simple code that requires that data are presented in lists (see the example below). multbar <- function(list.of.lists,...,condnames=0,pal=colorRampPalette(c('grey','cornsilk')),seriesnames=0,legendpos='topleft',legh=TRUE,do.pty='s') { par(pty=do.pty,mgp=c(1.9,0.8,0),oma=c(0,0,0,0),mar=c(4,3,2,1),bg='transparent',bty='o',tck=0.02,yaxs='i') NofList <- length(list.of.lists) NofSubList <- length(list.of.lists]) if(condnames==0){condnames=c(1:NofList)} if(seriesnames==0){seriesnames=c(1:NofSubList)} dim.mat.treat <- (NofList+1)*NofSubList pos <- c(1:dim.mat.treat) pos <- matrix(pos,nrow=(NofList+1)) nbreaks

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R 2.10.0 is Out!

October 26, 2009
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R 2.10.0 is Out!

The new R 2.10.0 is out! Get it from here. If you like take a look at these posts for some miscellaneous advices to make the upgrade easier. Fell free to contribute with suggestions about how to upgrade your R installation.

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Free statistics e-books for download

October 25, 2009
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This post will eventually grow to hold a wide list of books on statistics (e-books, pdf books and so on) that are available for free download.  But for now we’ll start off with just one several books: The Elements of Statistical Learning written by Trevor Hastie, Robert Tibshirani and Jerome Friedman. you can legally download

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