cluster analysis - weka is able to use classification via clustering -


i new weka tool. can combine classification , clustering? i.e first cluster data , classify instances cluster wise. requirement steps need follow.

thanks in advance.

yes can. easy classificationviaclustering classifier (class classificationviaclustering).

steps in java pseudocode:
1. create simplekmeans clusterer

simplekmeans skm = new simplekmeans(); skm.setnumclusters(5); // in example clusterer uses 5 clusters

2. read dataset , set class index

bufferedreader reader = new bufferedreader(new filereader("[path].arff")); // replace [path] path dataset instances data = new instances(reader); data.setclassindex([your class index]); // if first attribute class, insert 0

3. create classifier 

classifierviaclustering cvc = new classificationviaclustering(); cvc.setclusterer(skm); // let classifier use simplekmeans clusterer cvc.buildclassifier(data);

then, when want classify new instance:

instance instancetoclassify = new instance(data.firstinstance()); instancetoclassify.setdataset(data); // instance classified has have access dataset double class = cvc.classifyinstance(instancetoclassify); // classify instance based cluster belongs

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