1745 search results for "Excel"

Plotting Likert Scales

December 4, 2012
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Plotting Likert Scales

Graphs can provide an excellent way to emphasize a point and to quickly and efficiently show important information. Sadly, poor graphs can be a good way to waste space in an article, take up time in a presentation, and waste a lot of ink all while providing little to no information. Excel has made it

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What exactly is “elegant” code in R?

December 4, 2012
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In celebration of my achieving 10,000 “reputation” on Stack Overflow, I’m re-posting one of my questions from there that was (as I had expected) deleted after being live for about 5 hours. In that time, I never really got a satisfactory answer, so if anyone wants to offer one in the comments, that would be

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To Transform or Not To Transform

December 3, 2012
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Many of the forecasting packages in R requires a time series that is covariance stationary. For those who are not familiar with this term, there is an excellent online textbook by Hyndman and Athanasopoulos, Forecasting: Principles and Practice. Click ...

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The surprisingly weak case for global warming

December 3, 2012
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The surprisingly weak case for global warming

I welcome your thoughts on this post, but please read through to the end before commenting. Also, you’ll find the related code (in R) at the end. For those new to this blog, you may be taken aback (though hopefully not bored or shocked!) by how I expose my full process and reasoning. This is

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Save R objects, and other stuff

November 29, 2012
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Save R objects, and other stuff

Yesterday, Christopher asked me how to store an R object, in order to save some time, when working on the project. First, download the csv file for searches related to some keyword, via http://www.google.com/trends/, for instance “sunglasses“. Recall that csv files store tabular data (numbers and text) in plain-text form, with comma-separated values (where csv term comes from). Even...

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I give up, I am embracing pie charts

November 27, 2012
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I give up, I am embracing pie charts

Most statisticians know that pie charts are a terrible way to plot percentages. You can find explanations here, here, and here as well as the R help file for the pie function which states: Pie charts are a very bad … Continue reading →

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Using R in the Human Resources department

November 27, 2012
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Ajay Ohri, author of R for Business Analytics, was recently interviewed about using R instead of Excel for human resources management. Human Resources is an increasingly analytics-driven field, with predictive modeling now used to prioritize applicants for interview and to organize workspaces, to give just two examples. As Ajay points out, R gets over the limitations of spreadsheets: There...

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Rcpp 0.10.1

November 27, 2012
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A the new Rcpp release 0.10.1 arrived this morning on CRAN (as already has Windows binaries) and in Debian. This is a follow-up to the recent 0.10.0 release which extends the exciting new Rcpp-attributes and Rcpp-sugar work further, and as in a n...

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OpenScoring: Open Source Scoring of PMML Models via REST

November 27, 2012
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OpenScoring: Open Source Scoring of PMML Models via REST

The other day I stumbled accross an amazing PMML model API called jpmml.  It's written in Java and supports PMML 4.1 (and older).  Neural networks, random forests, regression and trees PMML models can be consumed and used for scoring.I decide...

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"Dominant" Color Palettes with k-means

November 27, 2012
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"Dominant" Color Palettes with k-means

The idea of deriving color palettes from images has long been an interest of mine. There are places you can do this online, but it’s at least plausible that you might want to identify dominant colors programatically, for a large number of image...

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