319 search results for "Anova"

Let’s Do Some MORE Hierarchical Bayes Choice Modeling in R!

November 3, 2014
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Let’s Do Some MORE Hierarchical Bayes Choice Modeling in R!

R enables us to "test drive" statistical models by running simulations and analyzing actual data. We can look at the output and get some sense of how the whole thing works. The goal is to provide a realistic application that is not too difficult to fol...

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Analysing a randomised complete block design with vegan

November 3, 2014
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Analysing a randomised complete block design with vegan

It has been a long time coming. Vegan now has in-built, native ability to use restricted permutation designs when testing effects in constrained ordinations and in range of other methods. This new-found functionality comes courtesy of Jari (mainly) and my efforts to have vegan permutation routines use the permute package. Jari also cooked up a standard interface...

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Type III tests and R

October 28, 2014
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by Terry M. Therneau Ph.D. Faculty, Mayo Clinic About a year ago there was a query about how to do "type 3" tests for a Cox model on the R help list, which someone wanted because SAS does it. The SAS addition looked suspicious to me, but as the author of the survival package I thought I should understand...

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Get Some Class

October 13, 2014
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Get Some Class

By Chris Campbell – Senior Consultant, UK. R is a classy language. Look: x <- matrix(1:9, nrow = 3) x ## ## 1 4 7 ## 2 5 8 ## 3 6 9 class(x) ## … Continue reading →

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Newcastle R course, a write-up

September 22, 2014
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I recently attended a week-long R course in Newcastle, taught by Colin Gillespie. It went from “An Introduction to R” to “Advanced Graphics” via a day each on modelling, efficiency and programming. Suffice to say it was an intense 5 days! Overall it was the best R course I’ve been on so far. I’d recommend it to others,...

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An exercise in non-linear modeling

September 7, 2014
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An exercise in non-linear modeling

In my previous post I wrote about the importance of age and why it is a good idea to try avoiding modeling it as a linear variable. In this post I will go through multiple options for (1) modeling non-linear effects in a linear regression setting, (2) benchmark the methods on a real dataset, and (3) look at how...

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Keep your team informed with “slackr”

September 5, 2014
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Keep your team informed with “slackr”

Karl Broman did a spiffy job summarizing a good number of the options available to R folk if they want to get notifications from R. You can also generate OS X notifications as well. If you’re using Slack for team coordination and communications, you’ve got a new option - slackr that also enables you...

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An adverse consequence of fitting "maximal" linear mixed models

August 23, 2014
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An adverse consequence of fitting "maximal" linear mixed models

Distribution of intercept-slope correlation estimates with 37 subjects, 15 itemsDistribution of intercept-slope correlation estimates with 50 subjects, 30 itemsShould one always fit a full variance covariance matrix (a "maximal" model) when one analyze...

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What your twitter friends say about you and your interests

August 10, 2014
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What your twitter friends say about you and your interests

This post is first in a series that looks at the inferences you can make using social media data. The …Continue reading →

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Guns are Cool – Differences between states

August 3, 2014
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Guns are Cool – Differences between states

Last week my blog showed that there are differences between states in the shootingtracker database. This week it is attempted to understand why states are different. A number of variables were extracted from a few sources, among which gun laws, % ...

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