pacman::p_load(data.table, microbenchmark ) train train_mat f1 f2 microbenchmark(f1(),f2(),times=10) [Read more...]

##### Removing constant features cat("n## Removing the constants features.n") for (f in names(train)) { if (length(unique(train[[f]])) == 1) { cat(f, "is constant in train. We delete it.n") train[[f]] [Read more...]

I find this code super useful because R’s implementation of xgboost (and to my knowledge Python’s) otherwise lacks support for a grid search: [Read more...]

I have (sometimes incomplete) data on addresses that looks like this: data [Read more...]

Writing an R package is simple. Writing an R package via Github is simple and smart. Github adds all the traditional benefits of version control, in addition to showing off your work and providing and facilitating publication of your package. This tutorial was inspired by a blog post from the ... [Read more...]

Today, 3/14/2015, is Pi Day (see http://piday.org). In honor of Pi Day, I threw together a little R code on Github, which discusses pi, prints it, and creates Julia set (fractal) images based on it: https://github.com/hack-r/Rpiday Happy Pi Day! [Read more...]

# Recombine Test + Training ———————————————– a [Read more...]

The second column is simply the first column divided by the variance of the response that have been OOB up to that point (20 trees), times 100. Source: https://stat.ethz.ch/pipermail/r-help/2008-July/167748.html [Read more...]

Just use qplot(votes, rating, data = movies) + geom_smooth() [Read more...]

You thought it was Hadley Wickham, right? Nope! ggplot2 comes from  Grammar of Graphics developed by Leland Wilkinson [Read more...]

Just use panel.lmline() [Read more...]

  ____  sample_size = 10 ____  R.eval “x __  R.eval “summary(x)” ____  R.eval “sd(x)” With a here document: require "rinruby" #Set all your variables in Ruby n = 10 beta_0 = 1 beta_1 = 0.25 alpha = 0.05 seed = 23423 R.x = (1..n).entries #Use actual R code to perform the analysis R.eval […] [Read more...]

If you want to copy data from an R variable named rdat into the Windows clipboard (for example, to copy into Excel) use: [Read more...]