.EN.TH C4.5 1.SH NAME.PPc4.5rules \- form production rules from unpruned decision trees.SH SYNOPSIS.PP.B c4.5rules[ \fB-f\fR filestem ][ \fB-u\fR ][ \fB-v\fR verb ][ \fB-F\fR siglevel ][ \fB-c\fR cf ][ \fB-r\fR redundancy ].SH DESCRIPTION.PP.I C4.5rules reads the decision tree or trees produced by C4.5 and generatesa set of production rules from each tree andfrom all trees together.All files read and written by C4.5 are of the form.I filestem.extwhere.I filestemis a file name stem that identifies the induction task and.I extis an extension that defines the type of file.The Rules programexpects to find a.B names filedefining class, attribute and attribute value names, a.B data filecontaining a set of objects whose class and value of eachattribute is specified, a.B unpruned filegenerated by C4.5 from the.B data file,and (optionally) a.B test filecontaining unseen objects..PPFor each tree that it finds, the program generates a set ofpruned rules, and then sifts this set in an attempt to findthe most useful subset of them.  If more than one tree wasfound, all subsets are then merged and the resulting compositeset of rules is then sifted.  The final set of rules is savedin a machine-readable format in a.B rulesfile.Each of the rulesets produced is then evaluated on theoriginal training data and (optionally) on the test data..PP.SH OPTIONS.PP.TP 12.BI \-f filestem\^Specify the filename stem (default.B DF)..TP.B \-uEvaluate rulesets on unseen cases in file.I filestem.test..TP.BI \-v verb\^Set the verbosity level [0-3] (default 0)..TP.BI \-F siglevel\^Invoke Fisher's significance test when pruning rules.If a rule contains a condition whose probability of being irrelevantis greater than the stated level, the rule is pruned further(default: no significance testing)..TP.BI \-c cf\^Set the confidence level used in forming the pessimisticestimate of a rule's error rate (default 25%)..TP.BI \-r redundancy\^If many irrelevant or redundant attributes are included, estimatethe ratio of attributes to ``sensible'' attributes (default 1)..PP.SH FILES.PP.in 8c4.5.brc4.5rules.brfilestem.data.brfilestem.names.brfilestem.unpruned  (unpruned trees).brfilestem.rules  (production rules).brfilestem.test   (unseen data).in 0.PP.SH SEE ALSO.PPc4.5(1), consultr(1).SH BUGS