## Two-way analysis of variance: two-way ANOVA in R

August 7, 2009
By

The one-way analysis of variance is a useful technique to verify if the means of more groups are equals. But this analysis may not be very useful for more complex problems. For example, it may be necessary to take into account two factors of variability to determine if the averages between the groups depend on the group classification...

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## Two-way analysis of variance: two-way ANOVA in R

August 7, 2009
By

The one-way analysis of variance is a useful technique to verify if the means of more groups are equals. But this analysis may not be very useful for more complex problems. For example, it may be necessary to take into account two factors of variability to determine if the averages between the groups depend on the group classification...

Read more »

## Additive vs. dominance two-allele genetic model by DIC

August 7, 2009
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Two-allele model has alleles A1 and A2 and genotypes A1A1, A1A2, and A2A2. This model can be fitted using only additive effect (restricted model) or additve+dominance effect. (full model) The later model has one parameter more than the former. I was using this model lately and got weird DIC results - the full model had less number...

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## Additive vs. dominance two-allele genetic model by DIC

August 7, 2009
By

Two-allele model has alleles A1 and A2 and genotypes A1A1, A1A2, and A2A2. This model can be fitted using only additive effect (restricted model) or additve+dominance effect. (full model) The later model has one parameter more than the former. I was using this model lately and got weird DIC results - the full model had less number...

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## CacheSweave

August 6, 2009
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I finally figured out how to use the R package "cachesweave". The trick is that the code chunks must follow some order, like the following:-----------------------------------------------------------=setCacheDir("testcache")@=library(Zelig)library(memis...

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## R 64 bit on Mac OSX with ESS

August 6, 2009
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So today I compiled 64 bit R 2.91 on Mac OS X   10.5.7 in order to get maximum speed for my analyses. The speed increase I got was 15-25 %, when I ran some tests with matrix calculation and intensive loops. Note that you can also download optimized binaries from  http://r.research.att.com/, although they are

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August 6, 2009
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## My mi presentation at the useR! 2009

August 4, 2009
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I have been to many conferences. Most of them are of Political Science. The common feature of these conferences is that the audience size is always small. If you get 10 audiences in your panel, your must be a big name.My presentation at the useR! 20...

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## My mi presentation at the useR! 2009

August 4, 2009
By

I have been to many conferences. Most of them are of Political Science. The common feature of these conferences is that the audience size is always small. If you get 10 audiences in your panel, your must be a big name.My presentation at the useR! 20...

Read more »

## Non-parametric methods for the study of the correlation: Spearman’s rank correlation coefficient and Kendall tau rank correlation coefficient

August 3, 2009
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We saw in the previous post, how to study the correlation between variables that follow a Gaussian distribution with the Pearson product-moment correlation coefficient. If it is not possible to assume that the values follow gaussian distributions, we have two non-parametric methods: the Spearman's rho test and Kendall's tau test.For example, you want to study the productivity...

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## Non-parametric methods for the study of the correlation: Spearman’s rank correlation coefficient and Kendall tau rank correlation coefficient

August 3, 2009
By

We saw in the previous post, how to study the correlation between variables that follow a Gaussian distribution with the Pearson product-moment correlation coefficient. If it is not possible to assume that the values follow gaussian distributions, we have two non-parametric methods: the Spearman's rho test and Kendall's tau test.For example, you want to study the productivity...

Read more »

## Rcpp 0.6.6

August 3, 2009
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Version 0.6.6 of Rcpp went off to CRAN and Debian earlier as another small maintenance release. While the diffstat output that will appear in cranberries may look impressive, it ste...

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## Rcpp 0.6.6

August 3, 2009
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Version 0.6.6 of Rcpp went off to CRAN and Debian earlier as another small maintenance release. While the diffstat output that will appear in cranberries may look impressive, it stems c...

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## Rcpp 0.6.6

August 3, 2009
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Version 0.6.6 of Rcpp went off to CRAN and Debian earlier as another small maintenance release. While the diffstat output that will appear in cranberries may look impressive, it ste...

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## R GUI page on the R wiki

August 3, 2009
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I've started the process of moving the content of this page to the R wiki. The motivation is that the content will become dynamic and updated much more often, people can add their own project, we can have use cases of each gui, tutorials, feature c...

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