690 search results for "sql"

analyze the national household travel survey (nhts) with r and monetdb

March 18, 2014
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if you've ever gotten stuck in traffic and started wondering what data might be available to better design the network of roads and rail, rev your engines for the national household travel survey (nhts).  dating back to the same decade as eisenhow...

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Software Carpentry at UVA, Redux

March 12, 2014
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Software Carpentry at UVA, Redux

Software Carpentry is an international collaboration backed by Mozilla and the Sloan Foundation comprising a team of volunteers that teach computational competence and basic programming skills to scientists. In addition to a suite of online lessons, ...

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Confounding & collinearity

March 11, 2014
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Confounding & collinearity

(This article was first published on MATHEMATICS IN MEDICINE, and kindly contributed to R-bloggers) Confounding and collinearity Introduction In this blog article, I will discuss about the bias introduced in estimation of coefficient of a given explanatory variable due to the presence of confounding factors. After that, I will try to demonstrate about the effect of variable collinearity on...

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Upcoming NYC R Programming Classes

March 10, 2014
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Upcoming NYC R Programming Classes

It is our pleasure to once again offer the intensive R beginner level course for the third time! Beginning this Sunday, the 35 hour course will walk you through the basic operations and characteristics of R, all the way to having a firm understanding of data manipulation and visualization. Also launching this weekend are two... Read more »

Using Google BigQuery with R

March 10, 2014
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Using Google BigQuery with R

Hey everybody, this tutorial is about combining two great and powerful tools: R and Google BigQuery. Big Query: So but what is BigQuery? I think Google describes it very well on the developers page: “Querying massive datasets can be time consuming and expensive without the right hardware and infrastructure. Google BigQuery solves this problem by …

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What are the most common RNG seeds used in R scripts on Github?

March 6, 2014
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What are the most common RNG seeds used in R scripts on Github?

In the R programming language, the random number generator (RNG) is seeded each session using the current time and process ID. Via the magic of the popular Mersenne Twister PRNG, the values stored in .Random.seed are used sequentially each time … Continue reading →

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Review: Kölner R Meeting 26 Feburary 2014

March 4, 2014
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Review: Kölner R Meeting 26 Feburary 2014

Last week's Cologne R user group meeting was all about R and databases. We had three talks from a generic overview on how to connect R to databases, to a specific example with kdb+ and perhaps the future with ArangoDB, a NoSQL database.Connecting R with databasesDiego de Castillo's talk focused on the use of relational databases, such...

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twitteR now supports database persistence

February 23, 2014
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For a long time now I've wanted to add the ability for storing data from twitteR into a RDBMS. In the past I've done things by concatenating new results onto old results which simply becomes unwieldy. I know that many people have doctored up their own ...

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Interactive exploration of a prior’s impact

February 21, 2014
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Interactive exploration of a prior’s impact

The probably most frequent criticism of Bayesian statistics sounds something like “It’s all subjective – with the ‘right’ prior, you can get any result you want.”. In order to approach this criticism it has been suggested to do a sensitivity analysis (or robustness analysis), that demonstrates how the choice of priors affects the conclusions drawn

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Regression with multiple predictors

February 18, 2014
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Regression with multiple predictors

(This article was first published on Digithead's Lab Notebook, and kindly contributed to R-bloggers) Now that I'm ridiculously behind in the Stanford Online Statistical Learning class, I thought it would be fun to try to reproduce the figure on page 36 of the slides from chapter 3 or page 81 of the book. The result is a curvaceous surface...

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