# 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

 `1` ```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`

Markus Mayer

## References

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

## Examples

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34``` ```##---- 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.