3904 search results for "GIS"

R Notes: vectors

July 12, 2014
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  R is different from C family languages. It has a C syntax, but a Lisp semantics. Programmers from C/C++/Java world would find many usages in R adhoc and need to memorize special cases. This is because they use R from a C's perspective. R is a very...

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Item Response Theory and Item Information Exploration

July 10, 2014
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Item Response Theory and Item Information Exploration

In the following post I will map out some item information functions for item response theory (IRT) models using the common 3 parameter logistic model for binary responses. The model takes three parameters (obviously) which relate to the item features ...

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R Day at Strata NYC

July 8, 2014
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R Day at Strata NYC

RStudio will teach the new essentials for doing data science in R at this year’s Strata NYC conference, Oct 15 2014. R Day at Strata is a full day of tutorials that will cover some of the most useful topics in R. You’ll learn how to manipulate and visualize data with R, as well as

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analyze the demographic and health surveys (dhs) with r

July 8, 2014
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professors of public health 101 probably cite the results of the demographic and health surveys (dhs) more than all other data sources combined.  funded by the united states agency for international development (usaid) and administered by the tech...

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Reflections on useR! 2014

July 7, 2014
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Reflections on useR! 2014

UseR! 2014, the R user conference held last week in LA, was the most successful yet. Around 700 R users from around the world converged on the UCLA campus to share their experiences with the R language and to socialize with other data scientists, statisticians and others using R. The week began with a series of 3-hour tutorials on...

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Women Graduates in Math, Statistics, and Computer Information Systems

July 3, 2014
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Women Graduates in Math, Statistics, and Computer Information Systems

One of the more interesting talks at this year’s useR! Conference was the heR Panel discussing the role of women in the R community. They estimate that fewer than 15% of package authors are women. One of the points brought up was that this is less than the percentage of women in statistics. Perhaps this is more...

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useR! 2014 Highlights

July 3, 2014
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My talk went well; here are the slides and a link to the paper pre-print. Hadley Wickham gave an excellent tutorial on dplyr. Based on the talk I saw, I think I will take the data sets from the book and make some public visualizations on the Plotly we...

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Short course: Bayesian methods in health economics

July 2, 2014
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Chris, Richard and I tested this last March in Canada (see also here) and things seem to have gone quite well. So we have decided to replicate the experiment (so that we can get a bigger sample size!) and do the short course this coming November (...

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Parallel computing in R

July 1, 2014
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Parallel computing in R

Roughly a year ago I published an article about parallel computing in R here, in which I compared computation performance among 4 packages that provide R with parallel features once R is essentially a single-thread task package. Parallel computing is incredibly useful, but not every thing worths distribute across as many cores as possible. Actually,

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R Job Notifications Using Twitter

R Job Notifications Using Twitter There has been some interesting activity about getting R to send a notification somehow when a long running job is completed. The most notable entries I have seen in this category are RPushBullet for web notifications and pingr for audio notifications. Although RPushBullet looks really cool (and Dirk does great work), I wondered...

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