birchObj {birch} | R Documentation |
A birch object created from simulated data for the purposes of demonstration
data(birchObj)
A birch object with 318 subclusters. The object contains a list of
sumXi
sumXisq
N
members
This birch object was created from a simulated data set of two multivariate normals. Its primary use is for demonstrating functions in the help files. The sequence of commands for creating the object was as follows:
library(MASS) ## for mvrnorm library(birch) ## Create data set set.seed(1234) x <- mvrnorm(1.5e5, mu=rep(0,5), Sigma=diag(1,5)) x <- rbind(x, mvrnorm(1e5, mu=rep(10,5), Sigma=diag(0.1,5)+0.9)) ## Create birch object, and save it birchObj <- birch(x, 5) save(birchObj, file="birchObj.rda")
Harrington, J and Salibian-Barrera, M (2007) “Finding Approximate Solutions to Combinatorial Problems with Very Large Datasets using BIRCH”, submitted to Statistical Algorithms and Software, 2nd Special Issue Computational Statistics and Data Analysis. http://www.stat.ubc.ca/~harringt/birch.pdf.
Harrington, J and Salibian-Barrera, M (2008) “birch: Working with very large data sets”, submitted to Journal of Statistical Software. http://www.stat.ubc.ca/~harringt/birch-jss.pdf.
data(birchObj)