Monthly Archives: July 2009

Sometimes, you just need to use a plyr

July 10, 2009
By
Sometimes, you just need to use a plyr

I haven’t posted anything about R-nerdery in quite some time. But I have to pause for a moment, and sing the praises of a relatively new package that has made my life exponentially easier. The plyr package. R has the capability to apply a single function to a vector or list using apply or mapply,

Read more »

Presenting influence.ME at useR!

July 10, 2009
By
Presenting influence.ME at useR!

Today I presented influence.ME at the useR! conference in Rennes. Influence.ME is an R package for detecting influential data in mixed models. I developed this package together with Ben Pelzer and Manfred te Grotenhuis. More information about influence.ME can be ...

Read more »

Useful Links

July 9, 2009
By
Useful Links

Statistic on WikiPediaR homepageR download (first select the mirror)Blogs on R:Revolutions R BlogR bloggersPlanet RQuick-ROne R tip a dayData Mining With Rattle and RAniWikiR Graph GalleryR Tips / StatsRusRomain Francois blog"R" you ready?Learning RTai...

Read more »

Computing Statistics from Poorly Formatted Data (plyr and reshape packages for R)

July 9, 2009
By

  Premise I was recently asked to verify the coefficients of a linear model fit to sets of data, where each row of the input file was a "site" and each column contained the dependent variable through time (i.e. column 1 = time step 1, column 2 = time step 2, etc.). This format is cumbersome in that it...

Read more »

useR! slides

July 8, 2009
By

I've pushed my slides from the presentation I've given at useR! a few minutes ago here

Read more »

RGG# 154: demo of atomic functions

July 7, 2009
By
RGG# 154: demo of atomic functions

Przemyslaw Biecek has submitted this graph (and also others I will add later) to the graphics gallery A list of examples for the atomic functions polygon(), segments(), symbols(), arrows(), curve(), abline(), points(), lines(). this figure is t...

Read more »

Return

July 6, 2009
By

I'm back from vacation, so I'll post something substantive later today.

Read more »

Using R to Create Misc. Patterns [smocking]

July 4, 2009
By
Using R to Create Misc. Patterns [smocking]

Pattern Chunk   Premise My wife asked me to come up with some graph paper for creating smocking patterns. After a couple of minutes playing around with R-base graphics functions, it occurred to me that several functions in the sp package...

Read more »

Summarizing Grouped Data in R

July 3, 2009
By

A colleague of mine recently asked about computing basic summary statistics from grouped data in R. These are a couple examples that I suggested. Additional documentation for the plyr package can be found here. read more

Read more »

Remove files with a specific pattern in R

July 3, 2009
By
Remove files with a specific pattern in R

A quick basic tip which can come in handy whether you need to rapidly remove files from a directory:junk <- dir(path="your_path", pattern="your_pattern") # ?dirfile.remove(junk) # ?file.removeClearly, for advanced needs, you can use system() and al...

Read more »

Sponsors

Mango solutions



RStudio homepage



Zero Inflated Models and Generalized Linear Mixed Models with R

Quantide: statistical consulting and training

datasociety

http://www.eoda.de





ODSC

ODSC

CRC R books series





Six Sigma Online Training









Contact us if you wish to help support R-bloggers, and place your banner here.

Never miss an update!
Subscribe to R-bloggers to receive
e-mails with the latest R posts.
(You will not see this message again.)

Click here to close (This popup will not appear again)