WEKA Experimenter – Can’t select J48 as the baseline classifier in Analyse tab

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WEKA Experimenter - Can't select J48 as the baseline classifier in Analyse tab

Hi everyone,

I'm a university student using WEKA Experimenter for an assignment, and I've run into an issue that I can't figure out.

According to my practical instructions, after running the experiment, I should:

  • Go to the Analyse tab.
  • Click Test base → Select.
  • Choose J48 as the baseline classifier.
  • Click Perform test.

However, when I click Select, I only see two options:

  • Summary
  • Ranking

There are no classifiers (J48, NaiveBayes, IBk, etc.) available to choose.

At the same time, the Test output shows these errors:

Instance has missing value in resultset key column 5! Index 0 out of bounds for length 0

My lecturer thinks the experiment may not have completed successfully, but I have already run it to completion.

Has anyone experienced this issue before?

  • Is this a known WEKA bug?
  • Could it be caused by my experiment configuration or the result file?
  • What should I check to make J48 appear in the Test base selection?

I'm using WEKA 3.8.7.

Any suggestions would be greatly appreciated. Thanks!

submitted by /u/etervn
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