kmeansStepEllbowBIC: stepwise modelselection of k-means cluster using BIC and...

In kmeansstep: stepwise k-means cluster model selection

Description

stepwise modelselection of k-means cluster using BIC and Ellbow-Method

Usage

kmeansStepEllbowBIC(x, centers = 1, iter.max = 10, nstart = 10, algorithm = c("Hartigan-Wong", "Lloyd", "Forgy", "MacQueen"), trace = FALSE)

Arguments

x
centers
iter.max
nstart
algorithm
trace

Author(s)

Markus Mayer

References

http://sherrytowers.com/2013/10/24/k-means-clustering/

Examples

##---- Should be DIRECTLY executable !! ----
##-- ==>  Define data, use random,
##--	or do  help(data=index)  for the standard data sets.

## The function is currently defined as
function (x, centers = 1, iter.max = 10, nstart = 10, algorithm = c("Hartigan-Wong", 
    "Lloyd", "Forgy", "MacQueen"), trace = FALSE) 
{
    firstBIC <- kmeansBIC(kmeans(x, centers, iter.max, nstart, 
        algorithm, trace))
    centers <- centers + 1
    secondBIC <- kmeansBIC(kmeans(x, centers, iter.max, nstart, 
        algorithm, trace))
    centers <- centers + 1
    thirdBIC <- kmeansBIC(kmeans(x, centers, iter.max, nstart, 
        algorithm, trace))
    centers <- centers + 1
    fourthBIC <- kmeansBIC(kmeans(x, centers, iter.max, nstart, 
        algorithm, trace))
    el_first <- (firstBIC - secondBIC)/(secondBIC - thirdBIC)
    el_second <- (secondBIC - thirdBIC)/(thirdBIC - fourthBIC)
    while (el_second > el_first) {
        firstBIC <- secondBIC
        secondBIC <- thirdBIC
        thirdBIC <- fourthBIC
        centers <- centers + 1
        fourthBIC <- kmeansBIC(kmeans(x, centers, iter.max, nstart, 
            algorithm, trace))
        el_first <- el_second
        el_second <- (secondBIC - thirdBIC)/(thirdBIC - fourthBIC)
    }
    return(list(BIC = secondBIC, kmeans = kmeans(x, centers = centers - 
        2, iter.max, nstart, algorithm, trace)))
  }

kmeansstep documentation built on May 2, 2019, 5 p.m.