2171 search results for "map"

Reproducing the BMA exercise of Fernández, Ley and Steel (2001) in R

February 7, 2011
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Reproducing the BMA exercise of Fernández, Ley and Steel (2001) in R

In their paper Model uncertainty in cross-country growth regressions (Journal of Applied Econometrics 2001), Fernández, Ley and Steel (FLS) demonstrate the use of Bayesian Model Averaging (BMA) for a cross-section economic growth data set. This tutor...

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Peeking inside R functions

February 6, 2011
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R, like all good programming languages, treats functions as first class objects. Users can create functions, pass them as arguments, and have them returned as the result of other computations. You may be familiar with passing functions as arguments if you have used the apply family of functions (i.e. apply, sapply, lapply, mapply). For example, to get get...

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sab-R-metrics: Some Extra Visualization Customization

January 31, 2011
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sab-R-metrics: Some Extra Visualization Customization

Last post, I described a number of ways to show your data on a scatter plot. Ricky Zanker at THT has a similar post today for those looking to get some extra exposure and another take on R programming. Today, I plan to extend on this with a little more customization. First, if you've missed...

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sab-R-metrics: Some Extra Visualization Customization

January 31, 2011
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sab-R-metrics: Some Extra Visualization Customization

Last post, I described a number of ways to show your data on a scatter plot. Ricky Zanker at THT has a similar post today for those looking to get some extra exposure and another take on R programming. Today, I plan to extend on this with a little more customization. First, if you've missed...

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Review of “R Graphs Cookbook” by Hrishi Mittal

January 24, 2011
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Review of “R Graphs Cookbook” by Hrishi Mittal

Executive summary: Extremely useful for new users, informative to even quite seasoned users. Refereeing Once upon a time a publisher asked if I would referee a book (unspecified) about R.  In an instance that can only be described as psychotic I said yes.  That bit of insanity turned out to be a good thing. I … Continue reading...

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Pattern Matching for Transcription Factor Binding Sites

January 24, 2011
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I'm trying to search for binding sites for the transcription factor MAF (i.e. TFBS for MAF) in the promoter regions of various genes. I initially started out looking at a precomputed database of binding sites MAPPER. However the TFBS models that have ...

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Merging Multiple Data Frames in R

January 23, 2011
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Merging Multiple Data Frames in R

Earlier I had a problem that required merging 3 years of trade data, with about 12 csv files per year. Merging all of these data sets with pairwise left joins using the R merge statement worked (especially after correcting some errors pointed out by Ha...

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Keeping simple things simple

January 17, 2011
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My friend Jeff deserves a sincere congratulation for finally unveiling his rebranded R consultancy Lemnica. One notable feature of the new website is a section called esoteric R which discusses less frequently-visited corners of the R world. It even b...

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just for fun: Recovery.gov data snooping

January 11, 2011
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just for fun: Recovery.gov data snooping

Okay, so this isn't ecology related at all, but I like exploring data sets. So here goes...Propublica has some awesome data sets available at their website: http://www.propublica.org/tools/I played around with their data set on Recovery.gov (see hyperl...

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Run R in parallel on a Hadoop cluster with AWS in 15 minutes

January 10, 2011
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If you're looking to apply massively parallel resources to an R problem, one of the most time-consuming aspects of the problem might not be the computations themselves, but the task of setting up the cluster in the first place. You can use Amazon Web Services to set up the cluster in the cloud, but even that take some time,...

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