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IBM SPSS Modeler Cookbook by Scott Mutchler, Tom Khabaza, Meta S. Brown, Dean Abbott, Keith McCormick

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Transforming high skew and kurtosis variables with a multiple Derive node

In this recipe we will create transformations of numeric variables with high skew or kurtosis that makes them more normally distributed with a single Derive node by invoking the Multiple radio button. For many algorithms, normal distributions are assumed and therefore one often transforms variables so that this assumption is more nearly met.

Getting ready

This recipe uses the datafile cup98lrn_reduced_vars3.sav and the stream Recipe - variable construct multipleskew.str.

How to do it...

  1. Open the stream Recipe - variable construct multipleskew.str by clicking on File | Open Stream.
  2. Make sure the datafile points to the correct path to the datafile cup98lrn_reduced_vars3.sav.
  3. Add ...

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