Table 2.

The parameters used for support vector machine and random forest classifiers; all other parameters are kept as default.

Parameters		Value
Support vector machines
	C	100
	Gamma	1
	Kernel	linear
	Norm	l1
	Use-idfa	TRUE
	Max-dfb	1
	N-gram range	(1,1)
Random forests
	N-estimators	10
	Criterion	Gini
	Min-impurity-split	1.00E-07

^aUse-idf: when true, term weights are scaled by the number of documents they appear in.

^bMax-df: when set to 1, words that appear in every document are not removed.