Table 4.

Kendall's coefficient of concordance (Kendall's W statistic) and Friedman's chi square for selected clades: number of taxa (N) and number of specimens (N_s) detailed for each clade. W = 1 indicates identical suture closure sequence among clade members. Critical values based on (n − 1) degrees of freedom

Clade	N	Ns	Kendall's W (0–1)	Friedman
Hystricognathi	26	520	0.57	P < 0.001
Caviomorpha	21	435	0.64	P < 0.001
Caviidae	6	153	0.79	P < 0.001
Caviinae	3	70	0.84	P < 0.001
Cavoidea	10	236	0.71	P < 0.001
Dasyproctidae	3	53	0.86	P < 0.001
Echimyidae	2	35	0.89	P < 0.025
Erethizontidae	4	79	0.83	P < 0.001
Hystricidae	3	44	0.70	P < 0.001
Octodontidae	2	24	0.90	P < 0.025
Octodontoidea	6	100	0.67	P < 0.001