2224 search results for "regression"

Animations and GIFs using ggplot2

December 26, 2014
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Animations and GIFs using ggplot2

Tracing a regression lineDiverging density plotsHappy New Year plot Happy New Year everyone! For the last post of the year, I thought I'd have a little fun with the new animation package in R. It's actually really easy to use. I recently had some fun w...

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A small introduction to the ROCR package

December 19, 2014
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A small introduction to the ROCR package

I've been doing some classification with logistic regression in brain imaging recently. I have been using the ROCR package, which is helpful at estimating performance measures and plotting these measures over a range of cutoffs. The prediction and performance functions are the workhorses of most of the analyses in ROCR I've been doing. For those

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The Geometry of Classifiers

December 18, 2014
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The Geometry of Classifiers

As John mentioned in his last post, we have been quite interested in the recent study by Fernandez-Delgado, et.al., “Do we Need Hundreds of Classifiers to Solve Real World Classification Problems?” (the “DWN study” for short), which evaluated 179 popular implementations of common classification algorithms over 120 or so data sets, mostly from the UCI … Continue reading...

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Influence.ME now supports sampling weights

December 18, 2014
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Influence.ME is an R package that helps detecting influential cases in multilevel regression models. It has been around for a while now, and recent changes in lme4 broke the functionality of using influence.ME with sampling weights. Thanks to a kind contribution of some code by user Jennifer Bufford, influence.ME now should work with multilevel models… Continue Reading

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Joint Models with Categorical Longitudinal Outcomes

December 17, 2014
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Extending the Standard Joint Model In a previous post we have briefly introduced the framework of joint models for longitudinal and time-to-event data, and we have shown how models of this type can be fitted in R using package JMbayes. In that post we ...

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Notes from the Kölner R meeting, 12 December 2014

December 16, 2014
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Notes from the Kölner R meeting, 12 December 2014

Last week's Cologne R user group meeting was the best attended so far, and it was a remarkable event - I believe not a single line of R code was shown. Still, it was an R user group meeting with two excellent talks, and you will understand shortly why not much R code needed to be displayed.Introduction to Julia...

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Are high-reputation users quitting Stack Overflow?

December 14, 2014
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Are high-reputation users quitting Stack Overflow?

I spend a good amount of time on the programming Q+A site StackOverflow (and a smaller amount of time on its statistics sister site, Cross Validated). Recently this question on Meta Stack Overflow (the website’s discussion forum) caught my attention, raising the question of whether Stack Overflow had become “more negative” recently. It wasn’t the first...

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Analyzing Ponemon Cost of Data Breach

December 11, 2014
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Analyzing Ponemon Cost of Data Breach

I was recently presenting on the use of statistics for risk analysis at the SIRACon conference held in Minneapolos (Oct. 9th and 10th, 2014). I was explaining how models and algorithms work at a high level: given one or more observations and the outcomes, we build models or algorithms to learn how the observations can help predict the outcome. As examples I used things...

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CLassification Options for Titanic Competition

December 10, 2014
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Logistic RegressionNeural NetsNaive BayesDecision Trees

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Comparing the Bootstrap and Cross-Validation

December 8, 2014
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Comparing the Bootstrap and Cross-Validation

This is the second of two posts about the performance characteristics of resampling methods. The first post focused on the cross-validation techniques and this post mostly concerns the bootstrap. Recall from the last post: we have some simulations to evaluate the precision and bias of these methods. I simulated some regression data (so that I know the real...

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