2375 search results for "Twitter"

RghcnV3 2.0

August 7, 2011
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RghcnV3 2.0

Well, version 2.0 is in the can and I’ll be uploading to CRAN over the next couple of days. Lets go over the highlights. Prior to version 2.0 we had basically 3 kinds of data flowing around the package: V3 14 column format, zoo objects and mts objects.  The 14 column format has always been

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Number of components in a mixture

August 5, 2011
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Number of components in a mixture

I got a paper (unavailable online) to referee about testing for the order (i.e. the number of components) of a normal mixture. Although this is an easily spelled problem, namely estimate k in I came to the conclusion that it is a kind of ill-posed problem. Without a clear definition of what a component is,

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Positive coefficient regression in R

August 5, 2011
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Positive coefficient regression in R

Ever have a regression model where the coefficients don't make sense? I've been trying to predict electricity and gas consumption from daily activity schedules but a simple linear regression kept saying that demands should go down the more an activity is performed. Fortunately I found the nnls package and show here how you can use it to...

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Friday Links: R, OpenHelix Bioinformatics Tips, 23andMe, Perl, Python, Next-Gen Sequencing

August 5, 2011
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Friday Links: R, OpenHelix Bioinformatics Tips, 23andMe, Perl, Python, Next-Gen Sequencing

I haven't posted much here recently, but here is a roundup of a few of the links I've shared on Twitter (@genetics_blog) over the last two weeks.Here is a nice tutorial on accessing high-throughput public data (from NCBI) using R and Bioconductor.Cloud...

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CHCN: Canadian Historical Climate Network

August 4, 2011
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CHCN: Canadian Historical Climate Network

A reader asked a question about data from   environment canada.  He wanted to know if that data could somehow be integrated into the RGhcnV3 package.  That turned out to be a bit more challenging that I expected.  In short order I’d found a couple other people who had done something similar.  DrJ of course was

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Data Driven Story Discovery: Working Up a Multi-Layered Chart

August 3, 2011
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Data Driven Story Discovery: Working Up a Multi-Layered Chart

How many different dimensions (or “columns” in a dataset where each row represents a different sample and each column a different measurement taken as part of that sample) can you plot on a chart? Two are obvious: X and Y values, which are ideal for representing continuous numerical variables. If you’re plotting points, as in

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Merging Two Different Datasets Containing a Common Column With R and R-Studio

August 2, 2011
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Merging Two Different Datasets Containing a Common Column With R and R-Studio

Another way for the database challenged (such as myself!) for merging two datasets that share at least one common column… This recipe using the cross-platform stats analysis package, R. I use R via the R-Studio client, which provides an IDE wrapper around the R environment. So for example, here’s how to merge a couple of

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JSM 2011 [3]

August 2, 2011
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JSM 2011 [3]

Monday August 01 was the first full day of JSM 2011 and full is the appropriate word to describe the day! It started for me at 7am with a round table run by Marc Suchard on parallel computing (or at 3am if I am considering the time I woke up!). I was rather out of

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On not going viral

August 1, 2011
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On not going viral

This week the reader is directed to Messy Matters to read up on research conducted by Sharad Goel, Duncan Watts and Dan Goldstein in which they hunted for traces of "viral" diffusion on Twitter, Facebook, Yahoo!, and beyond. The results run counter to mainstream intuition.

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CRU Data in RghcnV3

July 31, 2011
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CRU Data in RghcnV3

As many have noted CRU have posted their data a bit ago and the usual gang has started to put it through the various “engines” for calculating a global temperature index. Thanks to others who worked this problem ahead of me getting the data in Rghcnv3 was not that hard, but it was not without

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