1537 search results for "regression"

Does playing baseball shorten your lifespan? (Answer: No.)

August 24, 2012
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Does playing baseball shorten your lifespan? (Answer: No.)

A National Institute for Occupational Safety and Health study, published in March, found that professional American football (NFL) players lived longer, on average, than similar "mere mortals" in the general population. Football is a dangerous sport, so that might seem surprising at first, until you consider the fact that NFL players are elite sportsmen: only the strongest, fastest and...

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Finding the Best Subset of a GAM using Tabu Search and Visualizing It in R

August 24, 2012
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Finding the Best Subset of a GAM using Tabu Search and Visualizing It in R

Finding the best subset of variables for a regression is a very common task in statistics and machine learning. There are statistical methods based on asymptotic normal theory that can help you decide whether to add or remove a variable at a time. The ...

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Data analysis using R – course in Essex

August 24, 2012
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Data analysis using R – course in Essex

This course is running 1-5 October at the University of Essex. There doesn’t seem to be a website but you register by writing to [email protected] Here’s what they say in their e-mail: Lecturers: Dr Werner Adler (University of Erlangen-Nuremberg; Co-author … Continue reading →

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What you get and what you should be getting: checking numerical code

August 22, 2012
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What you get and what you should be getting: checking numerical code

Whenever I write numerical code I spend half my time debugging my algebra, painstakingly uncovering one sign mistake after another in my calculations. Usually I have computed by hand the gradient or the integral of some nasty function, and I have to check it against a

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An example of OOP in GNU R using S4 Classes

August 18, 2012
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An example of OOP in GNU R using S4 Classes

Recently I have discussed with my friend from WLOG Solutions an implementation of banking cash management engine in GNU R. The code made a nice use of S4 classes so I thought it would be worth showing as an example.The problemEvery commercial bank need...

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Experience with Oracle R Enterprise in the Oracle micro-processor tools environment

August 17, 2012
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Experience with Oracle R Enterprise in the Oracle micro-processor tools environment

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Predictive analytics: Some ways to waste time

August 17, 2012
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Predictive analytics: Some ways to waste time

I am starting to take part at different competitions at kaggle and crowdanalytics. The goal of most competitions is to predict a certain outcome given some covariables.  It is a lot of fun trying out different methods like random forests, boosted ...

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Conference Presentations

August 15, 2012
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Conference Presentations

I recently gave a talk at the Ecological Society of America (ESA) annual meeting in Portland, OR and a poster presentation at the World Congress of Herpetology meeting in Vancouver, BC, Canada. Both presentations were comparing generalized linear mixed models … Continue reading →

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What does a generalized linear model do?

August 15, 2012
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What does a generalized linear model do?

What does a generalized linear model do? R supplies a modeling function called glm() that fits generalized linear models (abbreviated as GLMs). A natural question is what does it do and what problem is it solving for you? We work some examples and place generalized linear models in context with other techniques.For predicting a categorical Related posts:

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Probit Models with Endogeneity

August 15, 2012
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Probit Models with Endogeneity

Dealing with endogeneity in a binary dependent variable model requires more consideration than the simpler continuous dependent variable case. For some, the best approach to this problem is to use the same methodology used in the continuous case, i.e. 2 stage least squares. Thus, the equation of interest becomes a linear probability model (LPM). The

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