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I try to use J48 classifier from RWeka library in R (C4.5 algorithm). I can parametrize this classifier with C parameter which means 'confidence factor'. What does this value exactly mean? I know that bigger value means that I believe more my learning set is a good representation of the whole population and the algorithm will be less likely to prune. But what it exactly means? Is there any formula how to interpret this value?

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  • $\begingroup$ To close voters: This is not a programming question! It very clearly asks for an explanation of meaning of a parameter in a well specified version of a learning algorithm. $\endgroup$ – Jan Kukacka Apr 16 at 12:43

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