Weka software decision tree
After installing Weka 3.8, load a .csv file in the Explorer, I wanted to build a decision tree with the parameter "use training set".
Everything was installed ok (a self-extracting executable for 64-bit Windows that includes Oracle's 64-bit Java VM 1.8)
The file loaded fine as it was saved previously, using excel, as coma delimited. The problem lays in building the decision tree itself: I go to the tab Classify, select the test option "use training set" and start.
After starting, appears a particular result which, accordingly to some images I've seen before, should allow, from there, to right-click and select "Visualize Tree".
That doesn't happen, as you can see in the next image:
How do I fix this in order to build the decision tree?
You have run a ZeroR classifier, see http://chem-eng.utoronto.ca/~datamining/dmc/zeror.htm. The ZeroR classifier is not a decission tree classifier and can not be visualised as such. You need to train an actual decission tree classifier, J48 is one of them. See http://facweb.cs.depaul.edu/mobasher/classes/ect584/WEKA/classify.html for a guide on how to do so.