2786 search results for "ggplot"

R and the Weather

February 6, 2014
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R and the Weather

by Joseph Rickert The weather is on everybody's mind these days: too much ice and snow east of the Rockies and no rain to speak fo in California. Ram Narasimhan has made it a little easier for R users to keep track of what's going on and also get a historical perspective. His new R package weatherData makes it...

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Better living through zero-one inflated beta regression

February 6, 2014
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Better living through zero-one inflated beta regression

Dealing with proportion data on the interval $$ is tricky. I realized this while trying to explain variation in vegetation cover. Unfortunately this is a true proportion, and can’t be made into a binary response. Further, true 0’s and 1’s rule out beta regression. You could arcsine square root transform the data (but shouldn’t; Warton and Hui 2011)....

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Optimizing Probability Thresholds for Class Imbalances

February 6, 2014
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Optimizing Probability Thresholds for Class Imbalances

One of the toughest problems in predictive model occurs when the classes have a severe imbalance. We spend an entire chapter on this subject itself. One consequence of this is that the performance is generally very biased against the class with the smallest frequencies. For example, if the data have a majority of samples belonging to the first...

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Craig Bellamy – quite dplyr

February 4, 2014
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Craig Bellamy – quite dplyr

This weekend brought a couple of firsts in Cardiff’s winner against Norwich After a wretched time at Manchester United, Wilfried Zaha recorded his first Premiership assist, whilst, more interestingly, Craig Bellamy became the first player in history to score for seven different Premier League clubs To celebrate, I thought it was worth taking a quick

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R is 15th of top programming languages in latest RedMonk ranking

February 3, 2014
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R is 15th of top programming languages in latest RedMonk ranking

Analyst firm RedMonk periodically publishes rankings of the Top 20 programming languages, as measured by activity on StackOverflow and number of repositories on GitHub. In their most recent ranking (January 2014), R is ranked #15 amongst all programming languages. An impressive ranking for a domain-specific language; the top 3 were the general-purpose languages Java, Javascript and PHP. Here's a...

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Meticulously recreating bitmap plots in R

February 3, 2014
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Meticulously recreating bitmap plots in R

There’s a hard-fought drive on Wikimedia commons to convert those images that should be in vector format (i.e. graphs, diagrams) from their current bitmap form. At the time of writing, the relevant category has over 7000 images in the category … Continue reading →

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Data Analysis Steps

February 3, 2014
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Data Analysis Steps

After going through the overview of tools & technologies needed to become a Data scientist in my previous blog post, in this post, we shall understand how to tackle a data analysis problem.Any data analysis project starts with identifying a business problem where historical data exists. A business problem can be anything which can include prediction...

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Picking a gui interface for R

February 3, 2014
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Recently I decided to switch statistical programs used introductory statistics course for masters students that I teach at the University of Arkansas. Historically this course has been taught with SPSS, but I am attempting the switch to R this semeste...

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Teaching a Class of Undergrads, RStudio Server, and My Ubuntu Machine

February 2, 2014
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Teaching a Class of Undergrads, RStudio Server, and My Ubuntu Machine

I was chatting about public speaking with my brother, who is a Lecturer in the Faculty of Pharmacy at UofT, when he offered me the opportunity to come to his class and teach about R.  Always eager to spread the … Continue reading →

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Bayesian analysis of sensory profiling data

February 2, 2014
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Bayesian analysis of sensory profiling data

I looked at Bayesian analysis of sensory profiling data in May and June 2012. I do remember not being totally happy with the result and computations taking a bit more time than I wanted. But now it is 2014, I can use STAN and I have been thinking about...

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