94 search results for "iris"
Laplace’s liberation army
Simple Parallel randomForest with doMC package
I have been exploring how to speed up some of my R scripts and have started reading about some amazing corners of R. My first weapon was the Rcpp and RcppArmadillo package. These are wonderful tools and even for someone that has never written c++ before, there are enough to examples and documentation to get started. I...
Custom CSS for HTML generated using RStudio
People have been telling me for a while that the latest version of RStudio, the IDE for R, is a great way to generate reports. I finally got around to trying it out and for once, the hype is justified. Start with this excellent tutorial from Jeremy Anglim. Briefly: the process is not so different 
Why trust some supposed laws of statistical sampling and…
Why trust some supposed laws of statistical sampling and convergence when you can just test them yourself? If you have a computer with R installed (also recommended: Rstudio) then you can stop dithering about whether these n=1000 studies cited in the n...
googleVis 0.2.17 is released: Displaying earth quake data
The next version of the googleVis package has been released on the project site and CRAN. This version provides updates to the package vignette and a new example for the gvisMerge function. The new sections of the vignette have been featured on this ...
Cheat sheet for prediction and classification models in R
Ricky Ho has created a reference a 6-page PDF reference card on Big Data Machine Learning, with examples implemented in the R language. (A free registration to DZone Refcardz is required to download the PDF.) The examples cover: Predictive modeling overview (how to set up test and training sets in R) Linear regression (using lm) Logistic regression (using glm)...
Discriminating Between Iris Species
The Iris data set is a famous for its use to compare unsupervised classifiers. The goal is to use information about flower characteristics to accurately classify the 3 species of Iris. We can look at scatter plots of the 4 variables in the data set and see that no single variable nor bivariate combination can achieve this. One approach to improve the separation 
Making R graphics legible in presentation slides
I only visited a few JSM sessions today, as I’ve been focused on preparing for my own talk tomorrow morning. However, I went to several talks in a row which all had a common problem that made me cringe: graphics … Continue reading →
Error metrics for multi-class problems in R: beyond Accuracy and Kappa
The caret package for R provides a variety of error metrics for regression models and 2-class classification models, but only calculates Accuracy and Kappa for multi-class models. Therefore, I wrote the following function to allow caret:::train t...
Simple distribution plot in R
Plot the distribution of a sample as bars and add a histogram line for visualizing the sample characteristics.
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Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
