1144 search results for "excel"

Machine Learning Examples in R

February 12, 2012
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Machine Learning Examples in R

This is a post that has been a long time in the making. Following on from the excellent Stanford Machine Learning Course I have made examples of the main algorithms covered in R.We have Linear RegressionFollowed by Neural NetworksAnd Support ...

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Revisiting homicide rates

February 10, 2012
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Revisiting homicide rates

A pint of R plotted an interesting dataset: intentional homicides in South America. I thought the graphs were pretty but I was unhappy about the way information was conveyed in the plots; relative risk should be very important but number … Continue reading →

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managing projects using RStudio

February 10, 2012
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managing projects using RStudio

We're continually amazed with new developments within RStudio, the integrated developed environment for R that we highlighted previously (Among others, Andrew Gelman agrees with us about its value). The most recent addition addresses one of our earlie...

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Monitoring Progress Inside a Foreach Loop

February 9, 2012
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The foreach package for R is excellent, and allows for code to easily be run in parallel. One problem with foreach is that it creates new RScript instances for each iteration of the loop, which prevents status messages from being logged to the console output. This is particularly frustrating during long-running tasks, when we are often unsure...

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Monitoring Progress Inside a Foreach Loop

February 9, 2012
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The foreach package for R is excellent, and allows for code to easily be run in parallel. One problem with foreach is that it creates new RScript instances for each iteration of the loop, which prevents status messages from being logged to the console output. This is particularly frustrating during long-running tasks, when we are often unsure how much...

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Early-February flotsam

February 7, 2012
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Early-February flotsam

Mike Croucher at Walking Randomly points out an interesting difference in operator precedence for several mathematical packages to evaluate a simple operation 2^3^4. It is pretty much a divide between Matlab and Excel (does the later qualify as mathematical software?) … Continue reading →

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Comparing correlations update

February 5, 2012
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I have just published R code for calculating CIs for differences between correlations on the Serious stats book blog. This covers independent correlations (taken from chapter 6 of the book) and dependent correlations (new R code written as a suppl...

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Comparing correlations: independent and dependent (overlapping or non-overlapping)

February 5, 2012
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Comparing correlations: independent and dependent (overlapping or non-overlapping)

In Chapter 6 (correlation and covariance) I consider how to construct a confidence interval (CI) for the difference between two independent correlations.  The standard approach uses the Fisher z transformation to deal with boundary effects (the squashing of the distribution and increasing asymmetry as r approaches -1 or 1). As zr is approximately normally distributed

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RStudio Server: accessing the RStudio R IDE through your browser

February 1, 2012
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I like having all my important documents and scripts in one single place. This saves me from having to synchronize them between the different workplaces I have, and makes backupping much less of a pain. One way of achieving this… See more ›

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Using LaTeX, R, and Sweave to Create Reports in Windows

January 30, 2012
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Using LaTeX, R, and Sweave to Create Reports in Windows

LaTeX is a typesetting system that can easily be used to create reports and scientific articles, and has excellent formatting options for displaying code and mathematical formulas. Sweave is a package in base R that can execute R code embedded in LaTe...

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