Description Usage Arguments Value Author(s) References See Also Examples
In vfold cross validation, the data are divided into v
subsets of
approximately equal size. Subsequently, one of the v
data parts is
excluded while the remainder of the data is used to create a GAMens
object. Predictions are generated for the excluded data part. The process
is repeated v
times.
1 2 
formula 
a formula, as in the 
data 
a data frame in which to interpret the variables named in

cv 
An integer specifying the number of folds in the crossvalidation. 
rsm_size 
an integer, the number of variables to use for random
feature subsets used in the Random Subspace Method. Default is 2. If

autoform 
if 
iter 
an integer, the number of base (member) classifiers (GAMs) in
the ensemble. Defaults to 
df 
an integer, the number of degrees of freedom (df) used for
smoothing spline estimation. Its value is only used when 
bagging 
enables Bagging if value is 
rsm 
enables Random Subspace Method (RSM) if value is 
fusion 
specifies the fusion rule for the aggregation of member
classifier outputs in the ensemble. Possible values are 
An object of class GAMens.cv
, which is a list with the
following components:
foldpred 
a data frame with, per fold, predicted class membership probabilities for the leftout observations. 
pred 
a data frame with predicted class membership probabilities. 
foldclass 
a data frame with, per fold, predicted classes for the leftout observations. 
class 
a data frame with predicted classes. 
conf 
the confusion matrix which compares the real versus predicted
class memberships, based on the 
Koen W. De Bock kdebock@audencia.com, Kristof Coussement K.Coussement@ieseg.fr and Dirk Van den Poel Dirk.VandenPoel@ugent.be
De Bock, K.W. and Van den Poel, D. (2012): "Reconciling Performance and Interpretability in Customer Churn Prediction Modeling Using Ensemble Learning Based on Generalized Additive Models". Expert Systems With Applications, Vol 39, 8, pp. 6816–6826.
De Bock, K. W., Coussement, K. and Van den Poel, D. (2010): "Ensemble Classification based on generalized additive models". Computational Statistics & Data Analysis, Vol 54, 6, pp. 1535–1546.
Breiman, L. (1996): "Bagging predictors". Machine Learning, Vol 24, 2, pp. 123–140.
Hastie, T. and Tibshirani, R. (1990): "Generalized Additive Models", Chapman and Hall, London.
Ho, T. K. (1998): "The random subspace method for constructing decision forests". IEEE Transactions on Pattern Analysis and Machine Intelligence, Vol 20, 8, pp. 832–844.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17  ## Load data: mlbench library should be loaded!)
library(mlbench)
data(Sonar)
SonarSub<Sonar[,c("V1","V2","V3","V4","V5","V6","Class")]
## Obtain crossvalidated classification performance of GAMrsm
## ensembles, using all variables in the Sonar dataset, based on 5fold
## cross validation runs
Sonar.cv.GAMrsm < GAMens.cv(Class~s(V1,4)+s(V2,3)+s(V3,4)+V4+V5+V6,
SonarSub ,5, 4 , autoform=FALSE, iter=10, bagging=FALSE, rsm=TRUE )
## Calculate AUCs (for function colAUC, load caTools library)
library(caTools)
GAMrsm.cv.auc < colAUC(Sonar.cv.GAMrsm[[2]], SonarSub["Class"]=="R",
plotROC=FALSE)

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