Reducing Input Data String Length (Reclassify)

For binomial logistic regression, and auto classifier models that include a binomial logistic regression model, string fields are limited to a maximum of eight characters. Where strings are more than eight characters, they can be recoded using a Reclassify node.

This example uses the stream named reclassify_strings.str, which references the data file named drug_long_name. These files are available from the Demos directory of any IBM® SPSS® Modeler installation. This can be accessed from the IBM SPSS Modeler program group on the Windows Start menu. The reclassify_strings.str file is in the streams directory.

This example focuses on a small part of a stream to show the sort of errors that may be generated with overlong strings and explains how to use the Reclassify node to change the string details to an acceptable length. Although the example uses a binomial Logistic Regression node, it is equally applicable when using the Auto Classifier node to generate a binomial Logistic Regression model.

Next