sdf_quicksort: Fast reordering of a list of class "sdfdata"
In mbgraphic: Measure Based Graphic Selection

Description Usage Arguments Details Value Note Author(s) References See Also Examples

Reorders a list of class "sdfdata" based on hierarchical clustering in connection with optimal leaf ordering for displaying scagnostics results in scaggrams.

1	sdf_quicksort(sdfdata)

sdfdata

A list of class "sdfdata" generated by function sdf or scag2sdf.

The reordering is based on clustering of the variables of sdfdata$data.

1-cor(sdfdata$data) is used as a similarity measure. The linkage method is average. Function seriate from package seriation is used.

A list of class "sdfdata".

This is a reordering based on similarities of variables not scatterplots. For reordering based on similarities of scatterplots see sdf_sort.

Katrin Grimm

Z. Bar-Joseph, E. D. Demaine, D. K. Gifford, and T. Jaakkola (2001) Fast Optimal Leaf Ordering for Hierarchical Clustering Bioinformatics 17(1) 22–29.

M. Hahsler, K. Hornik und C. Buchta (2008) Getting Things in Order: An Introduction to the R Package seriation Journal of Statistical Software 25(3) 1–34.

sdf, scag2sdf, sdf_sort, scaggram, iascaggram,

seriate in package seriation

data(Election2005)
# consider only demographic/economic information
election05_ds <- Election2005[,1:40]
## Not run: 
scagdf <- sdf(election05_ds)
# new order 
scagdf_o <- sdf_quicksort(scagdf)
# compare scaggrams
par(mfrow=c(1,2))
scaggram(scagdf,select=(c(1,5,9)))
scaggram(scagdf_o,select=(c(1,5,9)))

## End(Not run)