[S] Visualizing Decision Boundaries in Classifictation

Arman Maghbouleh (arman@csli.stanford.edu)
Mon, 13 Jul 1998 10:24:31 -0700


Greetings,

What do you all do to plot/visualize decision boundaries in classification
problems?

I have implemented a logistic regression classifier based on four
predictors. I want to see where the decision boundaries are for this
classifier, and later compare the boundaries to those from LDA, KNN, and
other classifiers I will implement.

I couldn't find any examples in the blue or yellow books, nor discussions
on the S archive. Barring help from this group, I will, for each pair of
predictors, predict on a grid of values, keeping other predictors fixed,
and mark predicted grid borders which have different predictions on each
side.

Any ideas, code, pointers for better approaches will be appreciated.

Thanks, Arman.

---------------------------
| Arman Maghbouleh
| Linguistics Department
| Stanford University
| Stanford, CA 94305 USA

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