Publications by heuristicandrew
doSMP removed from CRAN
If you do parallel processing in R on Windows, then you probably have heard of the doSMP package. However, it was recently removed from the CRAN repository with the terse message: Package ‘doSMP’ was removed from the CRAN repository. Revolution … Continue reading → Related To leave a comment for the author, please follow the...
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Scales and transformations in ggplot2 0.9.0
Some R code designed for ggplot2 0.8.9 is not compatible with ggplot2 0.9.0, and today the ggplot2 web site has outdated documentation which gives this broken example: Dennis Murphy points to the ggplot2 0.9.0 transition guide from where I derived … Continue reading → Related To leave a comment for the author, please follow the ...
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Plotting individual growth charts
This R code draws individual growth plots as shown in “Applied Longitudinal Data Analysis: Modeling Change and Event Occurrence” by Judith D. Singer and John B. Willett, an excellent book on multilevel modeling and survival analysis. This code recreates figure … Continue reading → Related To leave a comment for the author, p...
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Comparing continuous distributions with R
In R we’ll generate similar continuous distributions for two groups and give a brief overview of statistical tests and visualizations to compare the groups. Though the fake data are normally distributed, we use methods for various kinds of continuous distributions. … Continue reading → Related To leave a comment for the author...
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nnet2sas() supports centering and scaling
nnet2sas() version 1 introduced a way to export a nnet() model trained in R to Base SAS through metaprogramming, and now nnet2sas() version 2 introduces support for variable centering and scaling as implemented in caret::train(). See the link for version … Continue reading → Related To leave a comment for the author, please foll...
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lag function for data frames
When applying the stats::lag() function to a data frame, you probably expect it will pad the missing time periods with NA, but lag() doesn’t. For example: Nothing happened. Here is an alternative lag function made for this situation. It pads … Continue reading → Related To leave a comment for the author, please follow the link...
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Popup notification from R on Windows
After R is done running a long process, you may need to notify the operator to check the R console and provide the next commands. Without installing any more software or creating any batch files or VBS scripts, here is a simple way to create the popup notice in Windows Continue reading → Related To leave a comment for the author,...
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Geolocate IP addresses in R
This R function uses the free freegeoip.net geocoding service to resolve an IP address (or a vector of them) into country, region, city, zip, latitude, longitude, area and metro codes. Continue reading → Related To leave a comment for the author, please follow the link and comment on their blog: Heuristic Andrew » r-project. R-...
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Calculate RMSE and MAE in R and SAS
Here is code to calculate RMSE and MAE in R and SAS. RMSE (root mean squared error), also called RMSD (root mean squared deviation), and MAE (mean absolute error) are both used to evaluate models. MAE gives equal weight to all errors, while RMSE gives extra weight to large errors. Continue reading → Related To leave a comment fo...
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Bar plot with error bars in R
Here’s a simple way to make a bar plot with error bars three ways: standard deviation, standard error of the mean, and a 95% confidence interval. The key step is to precalculate the statistics for ggplot2. Continue reading → Related To leave a comment for the author, please follow the link and comment on their blog: Heuristic...
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