Monthly Archives: October 2009

R for system administration and scripting

October 10, 2009
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On several occassions, R had suggested itself as a language for systems scripting. By this I mean random little adminstrative task such as (re-)moving or maybe renaming files or directories and the like. One of such cases just happened a few minutes ago. The aforementioned Garmin Forerunner 405 can cooperate quite nicely with Linux using the gant reader for the ant wireless communication protocol...

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50000 Revisions Committed to R

October 10, 2009
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50000 Revisions Committed to R

oday Romain Francois posted an interesting topic in the R-help list, and you can read his blog post for more details: celebrating R commit #50000. 50000 is certainly not a small number; we do owe R core members a big “thank you” for their great efforts in this fantastic statistical language in the 13 years.

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Visualizing sample relatedness in a GWAS using PLINK and R

October 9, 2009
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Strict quality control procedures are extremely important for any genome-wide association study.  One of the first steps you should take when running QC on your GWAS is to look for related samples in your dataset.  This does two things for you.  First, you can get an idea of how many related samples you have in your dataset, and second,...

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celebrating R commit #50000

October 9, 2009
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celebrating R commit #50000

pre{ font-size: x-small !important ; border: 1px solid black ; } Today, Brian Ripley commited the revision 50 000 into R svn repository. ------------------------------------------------------------------------ r50000 | ripley | 2009-10-09...

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Comments on "Ecological Statistics with R"

October 8, 2009
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Comments on "Ecological Statistics with R"

Didrik Vanhoenacker has put together a site called Ecological Statistics with R.The site provides several resources useful to researchers who are new to R. It gives advice on installing R. It discusses how to use several standard techniques (ANOVA...

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“Outlook cannot open this item.” and tasks missing

October 8, 2009
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“Outlook cannot open this item.” and tasks missing

Recently Microsoft Office Outlook 2007 started giving me the vague error message Outlook cannot open this item. The item may be damaged. The message would appear randomly throughout the day. Sometimes five error message boxes would be stacked up on top of each other. OK, but which item? What kind of item? Is it an

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Delete rows from R data frame

October 8, 2009
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Delete rows from R data frame

Deleting rows from a data frame in R is easy by combining simple operations. Let’s say you are working with the built-in data set airquality and need to remove rows where the ozona is NA (also called null, blank or missing). The method is a conce...

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What ‘The power of R’ is saying

October 7, 2009
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What ‘The power of R’ is saying

Hey again,I was looking for random things at google and I found such an interesting site: www.wordle.net, were you can put lots of words or the url of a blog (like this for example) and you get a cloud with the words you put and you can change colors a...

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Factor Analysis in R

October 7, 2009
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Factor Analysis in R

This post shows an example of running a basic factor analysis in R.Additional Resources:Quick-Rpsych packageJame's Steiger's exampleFactoMineR packageThe Example:The example is based on responses by 117 university students to a 50 item version of the I...

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Efficient Variable Selection in R

October 7, 2009
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Efficient Variable Selection in R

This post sets out my procedure for efficiently and reliably selecting variables from a data.frame in RTHE PROBLEMFor years I have been tormented by the hassle of selecting variables in a data.frame. I often work with psychological datasets with hundre...

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