Table 3.

Results of logistic regression for the two listener groups on the five acoustic parameters as well as on the effect of stimulus language (English vs Japanese). The p-values of those predictors that were statistically significant in predicting fricative categories are shown in bold.

	English listeners				Japanese listeners
Acoustic predictors	Coefficient	Standard error	Z-value	p-value	Coefficient	Standard error	Z-value	p-value
M1	−5.4	1.5	3.5	<0.001	−5.1	2.0	−2.5	0.012
M2	−0.8	0.6	−1.5	0.134	−2.3	1.1	−2.1	0.032
M3	−1.3	1.1	−1.2	0.229	−0.6	1.2	−0.6	0.580
M4	−0.01	0.8	−0.02	0.983	−5.3	2.7	−1.9	0.051
Onset F2	1.7	0.7	2.2	0.026	4.3	2.0	2.2	0.027
Stimulus language	−1.3	1.6	−0.8	0.411	−2.2	1.0	−2.2	0.029
M1 × stimulus language	−3.9	3.2	−1.2	0.227	−2.4	3.0	−0.8	0.417
M2 × stimulus language	−2.2	1.5	−1.4	0.149	−0.2	1.5	−0.1	0.912
M3 × stimulus language	−0.9	1.7	−0.5	0.601	−2.4	2.0	−1.2	0.231
M4 × stimulus language	−21.8	8.0	−2.7	0.006	−11.7	5.8	−2.0	0.046
Onset F2 × stimulus language	0.6	1.1	0.6	0.571	−2.5	2.1	−1.2	0.218