Table 9.

Linear regression using features from the VSM and the Backlink model as predictors of age.

Model	Predictors	B
English (Backlink + VSM only) (R2 = 0.191, F(6, 110) = 4.314, p < 0.001)	Backlink switch count	−2.684***
	Backlink mean cluster size	−21.508
	Backlink median cluster size	−10.051
	Backlink max cluster size	2.289
	VSM median cluster size	8.357*
	VSM max cluster size	1.706
English (Backlink + VSM + WC & Rep) (R2 = 0.240, F(8, 108) = 4.271, p < 0.001)	Backlink switch count	−7.287***
	Backlink mean cluster size	−35.885*
	Backlink median cluster size	−5.935
	Backlink max cluster size	−0.908
	VSM median cluster size	8.038*
	VSM max cluster size	1.205
	Unique word count	3.179*
	Repetition	10.058*
Korean (Backlink + VSM only) (R2 = 0.087, F(6, 98) = 1.559, p = 0.167)	Backlink switch count	−0.471
	Backlink max cluster size	0.640
	VSM switch count	−0.241
	VSM mean cluster size	3.306
	VSM median cluster size	−5.159
	VSM max cluster size	−0.545
Korean (Backlink + VSM + WC & Rep) (R2 = 0.278, F(8, 96) = 4.621, p < 0.001)	Backlink switch count	−0.431
	Backlink max cluster size	0.279
	VSM switch count	−0.714
	VSM mean cluster size	−2.176
	VSM median cluster size	−2.201
	VSM max cluster size	−0.284
	Unique word count	0.118
	Repetition	5.224***
Korean (KDiff) (Backlink + VSM only) (R2 = 0.123, F(6, 98) = 2.286, p < 0.05)	Backlink switch count	−0.768
	Backlink max cluster size	0.348
	VSM switch count	0.032
	VSM mean cluster size	5.648
	VSM median cluster size	−7.451*
	VSM max cluster size	−0.642
Korean (KDiff) (Backlink + VSM + WC & Rep) (R2 = 0.294, F(8, 96) = 4.993, p < 0.001)	Backlink switch count	−0.491
	Backlink max cluster size	0.207
	VSM switch count	0.028
	VSM mean cluster size	2.546
	VSM median cluster size	−4.466
	VSM max cluster size	−0.241
	Unique word count	−0.278
	Repetition	4.449***

^*p < 0.05,

^**p < 0.01, and

^***p < 0.001.