Table 6. Classification effectiveness across the four weighting schema using F-measure, ordered by increasing variance.

Weight	Max	Min	Δ	Var
expF	0.9821	0.7639	0.2182	0.00358
logF	0.9858	0.7639	0.2219	0.00377
freq	0.9848	0.7639	0.2209	0.00382
binary	0.9866	0.7639	0.2227	0.00389