1216 search results for "Excel"

5000 R questions on stackoverflow.com

June 16, 2011
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The R tag on stackoverflow.com hit a milestone yesterday: 5000 questions about the R language. (The 5000th question was about the fortunes package, incidentally -- thanks to Andrie de Vries for pointing this out on Twitter.) Stackoverflow.com continue...

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RTextTools now 100% Java-free!

When we first wrote RTextTools, we opted to use RWeka for boosting and bagging algorithms for lack of a better alternative. We've discovered that this leads to all sorts of ugly rJava installation issues across platforms and prevents our users from getting started quickly. Recently, we've stumbled upon two excellent non-Java alternatives: LogitBoost in the

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REITs for Everybody Might Now Mean REITs for Nobody

June 12, 2011
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REITs for Everybody Might Now Mean REITs for Nobody

THIS IS MY OPINION AND ANALYSIS AND IS NOT INVESTMENT ADVICE.  YOU ARE RESPONSIBLE FOR YOUR OWN GAINS AND LOSSES. I think REITs traditionally attract conservative dividend investors (grandparents), but due to their recent behavior, REITs also attr...

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The pros and cons of robust data characterizations

The pros and cons of robust data characterizations

Over the years, I have looked at a lot of data contaminated with outliers, the subject of Chapter 7 of Exploring Data in Engineering, the Sciences, and Medicine.  That chapter adopts the definition of an outlier presented by Barnett and Lewis in their book Outliers in Statistical Data 2nd Edition

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Shared Ecological Modelling References

June 6, 2011
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05.06.2011 Today i started to create a list of books and articles about ecological modelling. In this list you will not only find general books about modelling but also books about spatial analysis, image analysis and other (in my opinion) important techniques useful in the context of ecological modelling. For the collection i use “Zotero”

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Visualizing small-scale paired data – combining boxplots, stripcharts, and confidence-intervals in R

June 3, 2011
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Visualizing small-scale paired data – combining boxplots, stripcharts, and confidence-intervals in R

Sometimes when working with small paired data-sets it is nice to see/show all the data in a structured form. For example when looking at pre-post comparisons, connected dots are a natural way to visualize which data-points belong together. In R this can be easily be combined with boxplots expressing the overall distribution of the data.  This

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Simulating CMYK mis-registration printing

June 3, 2011
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Simulating CMYK mis-registration printing

I recently came across a poster advertising a children's production of Shakespeare's The Tempest where they purposely used an effect to mimic a mis-registration in CMYK printing. You have probably seen this before as a slight offset in one of t...

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XLConnect 0.1-4

May 30, 2011
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XLConnect 0.1-4

Mirai Solutions GmbH (http://www.mirai-solutions.com) is pleased to release XLConnect 0.1-4. In the time since our first release (XLConnect 0.1-3, released on Feb 28, 2011) we received very positive and constructive feedback from the R community which heavily influenced the development … Continue reading →

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Which R documents to read, and which R packages to use

May 29, 2011
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Which R documents to read, and which R packages to use

There are lots of R documents and over 3000 R packages. Which documents to start with and which R packages to use are questions faced by many people. If you are new to R, an Introduction to R can be … Continue reading →

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BMS and the Fixed Effects Estimator – A Tutorial

This tutorial illustrates how to use Bayesian Model Averaging (BMA) with panel data using the R package BMS.Contents Introduction Fixed Effects Estimation by Demeaning the Data Fixed Effects Estimation with Dummy Variables Bibliography Downloads A ...

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