In this chapter, we discussed the basics of cross-validation and bootstrapping as well as exporting predictive models using PMML. We saw some examples of how to perform cross-validation and bootstrapping using the caret
package. We showed how to predict data usage from the models we created. We explored the PMML structure, examined how to export to PMML, and saw how to save the resulting object to an XML file for use in other software packages.
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