.EN.TH C4.5 1.SH NAME.PPconsult \- classify items using a decision tree.SH SYNOPSIS.PP.B consult[ \fB-f\fR FNS ][ \fB-t\fR ].SH DESCRIPTION.PP.I Consultreads a decision tree produced by c4.5 anduses this to classify items whose descriptionis provided by the user.The decision tree read is.I filestem.tree,where.I filestemis the file name stem (see manual entry for c4.5)..PP.I Consultprompts for the value of an attribute when needed.Unknown attribute values are specified as '?'..PPIf the attribute has discrete values, its valuecan be specified either as.ti 8.I v.brwhere v is one of the permissible values of the attribute, or as.ti 8.I "v1:p1, v2:p2, ... , vn:pn".brwhere the vi's are some or all of the permissible values of theattribute and the pi's are corresponding probabilities.If the sum of the pi's is less than 1, the remaining probabilityis distributed equally among the unspecified values of theattribute.  For example, if attribute A has possible valuesX, Y and Z, the reply.ti 8X:0.5.bris the same as.ti 8X:0.5, Y:0.25, Z:0.25.PPIf the attribute has real values, its value can bespecified either as.ti 8.I r.brwhere r is a real number, or as.ti 8.I r1 - r2.brwhere r1 and r2 are real numbers.  The latter form istaken to mean "somewhere in the interval [r1,r2]"..PPTo display the subtree of the decision tree with thecurrent node at the root, '?t' may be entered inresponse to a request for an attribute value..PPWhen all relevant attributes have been determined,consult will give one or more classes that the itemmight belong to.  The likelihood of a class may beindicated by a probability, followed sometimes by aprobability interval.  For example,.ti 8.I "C1  CF = 0.9 [0.85 - 1]".brmeans "class C1 with probability in the interval 0.85 - 1,and with best guess probability 0.9"..PPAt the end of each item, consult will prompt forretrial of the same item, a new item, or end of session.When retrying an item, the previous values of queriedattributes are displayed in square brackets.  If thevalue is unchanged, reply with a carriage return;otherwise, specify the changed value..PPOptions and their meanings are:.PP.TP 12.BI \-f filestem\^Specify the filename stem (default.B DF).TP.B \-tDisplay the decision tree at the start of the consultingsession..SH FILES.PP.in 8consult.brfilestem.names.brfilestem.tree.in 0.PP.SH SEE ALSO.PPc4.5(1).PP.SH BUGS