DATA MINING Desktop Survival Guide by Graham Williams
Desktop Survival Project Home List of Figures List of Tables Data Mining Data Mining Data Mining with Rattle Introduction Data Transform Explore A Model Building Framework Unsupervised Modelling Two Class Models Multi Class Models Regression Models Text Mining Evaluation and Deployment Moving into R Troubleshooting R for the Data Miner R Data Graphics in R Understanding Data Preparing Data Building Models Evaluating Models Algorithms Apriori Bagging Bayes Classifier Boosting Cluster Analysis Conditional Trees Hierarchical Clustering K-Means K-Nearest Neighbours Linear Models Logistic Regression Neural Networks Support Vector Machines Text Mining Open Products AlphaMiner Borgelt Data Mining Suite KNime R Rattle Weka Closed Products C4.5 Clementine Equbits Foresight GhostMiner InductionEngine ODM Enterprise Miner Statistica Data Miner TreeNet Virtual Predict Appendicies Glossary Bibliography Index

Remove Variables with no Variance

We also only want columns where there is some variance in the values, so also remove those columns with a minimum value equal to the maximum. Again, use is made of lapply to apply a function (in this case max and min) to the data.

> rmcols <- as.numeric(lapply(dat, min, na.rm=T)) ==
            as.numeric(lapply(dat, max, na.rm=T))
> rmcols <- rev(seq(1,ncol(dat))[rmcols])
> for (i in rmcols) dat[[i]] <- NULL
> ncol(dat)
[1] 59

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