Table 9.

Lexical richness measures by time point and genre.

Measure	Arg.1 and Exp.1			Arg.2 and Exp.2			Arg.3 and Exp.3			Arg.4 and Exp.4
	MD	t	p	MD	t	p	MD	t	p	MD	t	p
LD
Tlex/T	0.001	0.255	0.799	0.024	4.964	0.000*	0.029	6.305	0.000*	−0.002	−0.373	0.71
LV
MATTR	−0.007	−1.53	0.132	−0.006	−1.271	0.209	0.003	0.532	0.597	0.015	2.797	0.007*
Maas	0.003	3.745	0.000*	0.004	4.813	0.000*	0.002	1.966	0.054	−0.001	−1.446	0.154
LS_Frequency
AWL	−0.003	−1.474	0.146	−0.013	−3.558	0.001*	−0.003	−1.51	0.137	0.016	5.46	0.000*
Bigram	−0.047	−5.246	0.000*	0.013	0.971	0.336	−0.005	−0.434	0.666	−0.005	−0.403	0.689
Range
KFR_CW	0.42	6.661	0.000*	−0.29	−3.825	0.000*	−0.17	−2.297	0.026*	−0.073	−1.181	0.243
Word property
Familiarity	1.357	2.093	0.041*	2.42	2.663	0.010*	2.546	3.03	0.004*	−4.466	−5.922	0.000*
Meaningfulness	4.045	3.086	0.003*	1.464	0.828	0.412	4.15	2.916	0.005*	−8.482	−5.876	0.000*
Word specificity
Polysemy	−0.675	−2.685	0.010*	−0.72	−2.573	0.013*	−2.502	−8.82	0.000*	−0.097	−0.406	0.686
Hypernymy	−0.129	−2.893	0.005*	−0.098	−1.826	0.073	−0.035	−0.817	0.417	−0.042	−0.904	0.37

*p < 0.05; Arg., Argumentative; Exp., Expository. Not significant with Bonferroni adjustment.