2730 search results for "GIS"

Compactly display the structure of an arbitrary R object

September 21, 2012
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As you advance in your R use past “canned” functions and packages made by others, you may want to take information from one R object for use in another. For example, you may want to estimate a linear model, then use the results of that esti...

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Simple plot with text boxes

September 21, 2012
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Simple plot with text boxes

Was doing a little presentation to our research group and had to explain the difficulties of ‘collapsing’ longitudinal data into a single measure when the Y var is quite variable. For the particular Y var of interest, it represents burden … Continue reading →

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Obviousness of REITs?

September 20, 2012
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Obviousness of REITs?

I very much enjoy papers such as Antonacci, Gary, Risk Premia Harvesting Through Momentum (September 5, 2012). Available at SSRN: http://ssrn.com/abstract=2042750 or http://dx.doi.org/10.2139/ssrn.2042750 Faber, Mebane T., A Quantitative Approach to T...

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How to use your favorite fonts in R charts

September 20, 2012
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How to use your favorite fonts in R charts

Today's guest post comes from Winston Chang, a software developer at RStudio — ed. When it comes to making figures in R, you can use any font you like, as long as it's Helvetica, Times, or Courier. Using other fonts that are installed on your computer can seem an impossible task, especially if you want to save the output...

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Converting an R object to text, with dput()

September 20, 2012
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We’ve already briefly covered making a reproducible example, but I thought I’d go a little more in-depth on the very helpful function dput(). Whenever I am having trouble applying an operation to some R object, and need help, but want to av...

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Long-term precipitation data for your location from the US Historical Climatology Network using R

September 19, 2012
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Long-term precipitation data for your location from the US Historical Climatology Network using R

Abstract Long-term daily precipitation records from the US Historical Climatology Network (USHCN) are processed and summarized using R. Below is R code which examines the data from Livermore, CA, the closest available USHCN station to my present home ...

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The PMML Revolution: Predictive analytics at the speed of business

September 19, 2012
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The PMML Revolution: Predictive analytics at the speed of business

This guest post is by Alex Guazzelli, VP of Analytics at Zementis Inc. -- ed. PMML, the Predictive Model Markup Language, is the de facto standard to represent predictive analytics and data mining models. With PMML, it is extremely easy to move a predictive solution from one system to another, since it avoids proprietary issues and incompatibilities. Companies around...

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Automatic drug utilization reports with R and ggplot2

September 18, 2012
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Automatic drug utilization reports with R and ggplot2

This program takes a data set of drug utilisation of 4 fictional drugs in 10 fictional hospitals and plots each time-series with a locally weighted regression (Lowess) trend line. It also places an time-series trend of the usage for each … Continue reading →

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DESeq vs edgeR Comparison

September 18, 2012
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DESeq vs edgeR Comparison

Update (Dec 18, 2012): Please see this related post I wrote about differential isoform expression analysis with Cuffdiff 2.DESeq and edgeR are two methods and R packages for analyzing quantitative readouts (in the form of counts) from high-throughput e...

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Embedding \(\LaTeX\) in Tumblr

September 18, 2012
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The classic Pythagorean identity is:  \(sin^2(\theta) + cos^2(\theta) =1 \) The binomial formula which calculates the probability of obtaining k tails when flipping a coin n times, with a assumed probability p for each trial is: \( P(E)   = {n \choos...

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