Monthly Archives: October 2011

Calculating and graphing within-subject confidence intervals for ANOVA

October 4, 2011
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Calculating and graphing within-subject confidence intervals for ANOVA

Psychologists are gradually coming round to the view that it is a good idea to present interval estimates alongside point estimates of statistics. The most common statistic reported in psychology research is almost certainly the mean (strictly...

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Example 9.8: New stuff in SAS 9.3– Bayesian random effects models in Proc MCMC

October 4, 2011
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Example 9.8: New stuff in SAS 9.3– Bayesian random effects models in Proc MCMC

Rounding off our reports on major new developments in SAS 9.3, today we'll talk about proc mcmc and the random statement.Stand-alone packages for fitting very general Bayesian models using Markov chain Monte Carlo (MCMC) methods have been available for...

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Tutorial on using the rworldmap package

October 4, 2011
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Tutorial on using the  rworldmap package

This blog following up my previous oneattempts to explain how the geo-pie map was created. I do not know how to attach a .rflow file in this blog. What you can do is to copy the following code into Notepad … Continue reading →

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permute: a package for generating restricted permutations

October 4, 2011
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permute: a package for generating restricted permutations

Multivariate ordination methods are commonly used in ecology to investigate patterns in species composition in space or time. Constrained ordination methods such as redundancy analysis (RDA) and canonical correspondence analysis (CCA) are effectively just multiple regressions, but we lack the parametric theory to adequately test the statistical significance of terms in the model. Other techniques likewise lack the appropriate...

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How to show explained variance in a multilevel model

October 3, 2011
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How to show explained variance in a multilevel model

In this post I will show one way to display explained variance using a line chart. There is no default plot for displaying the effect of each factor on deviance of the model, so this is a tentative proposal for my dissertation. The following values were obtained using multilevel models performed in R (thanks for

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Drawing maps using shape files and R

October 3, 2011
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Drawing maps using shape files and R

Sometimes, the only thing we want is a chart that speaks for itself rather than boring regression tables in our research paper. Graphs are efficient at showing the broad picture of an issue. In fact, graphs in research papers seem to be gaining a momentum in political science. If you want a more in-depth discussion about this, you may...

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Oracle’s Big Data Appliance to include R

October 3, 2011
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At the Oracle OpenWorld conference in San Francisco today, Oracle announced the new Oracle Big Data Appliance, "a new engineered system that includes an open source distribution of Apache™ Hadoop™, Oracle NoSQL Database, Oracle Data Integrator Application Adapter for Hadoop, Oracle Loader for Hadoop, and an open source distribution of R." Oracle's foray into the Hadoop and NoSQL spaces...

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Visualizing Climbing Ropes

October 3, 2011
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Visualizing Climbing Ropes

Today’s market of climbing ropes offers a huge variety of models to choose from. If you don’t have a good idea of what you want, the task of selecting a rope can become a true challenge, or worst, almost a … Continue reading →

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The four steps to publication-grade graphics in R

October 3, 2011
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This Article is also available in EN, ES.

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OLS beta VS. Robust beta

October 3, 2011
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OLS beta VS. Robust beta

In financial context, is suppose to reflect the relation between a stock and the general market. A broad based index such as the S&P 500 is often taken as proxy for the general market. The , without getting into too … Continue reading →

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