Table 7: Statistics for the partial effects of a generalized additive mixed model fitted to the relative duration of edge segments in the Buckeye corpus. The trend for log frequency is positive accelerating. TPRS: thin plate regression spline.

A. parametric coefficients Estimate Std. Error t-value p-value

Intercept -1.9165 0.0592-32.3908 0.0001
Log LDL Edge Weight -0.1358 0.0400 -3.3960 0.0007
Phrase Rate 0.0047 0.0021 2.2449 0.0248
Log Ncount 0.1114 0.0189 5.8837 0.0001

B. smooth terms edf Ref.df F-value p-value

TPRS log Frequency 1.9007 1.9050 7.5495 0.0004
random intercepts word 1149.8839 1323.0000 31.4919 0.0001
random intercepts speaker 30.2995 39.0000 34.5579 0.0001