Table 2.

Effect tests for the logistic regression model of offspring sex ratio (proportion female) as a function of host density, the density of the native parasitoid Anisopteromalus calandrae, the presence/absence of the nonnative parasitoid Heterospilus prosopidis, and all two-way interactions.

Dependent variable	Independent variable	Likelihood ratio χ2	df	p
Sex ratio of A. calandrae	Log (host density)	2.52	1	0.112
	Log (A. calandrae density)	1.62	1	0.203
	Presence of H. prosopidis	4.85	1	0.028
	Log (host density) × log (A. calandrae density)	0.08	1	0.777
	Log (host density) × presence of H. prosopidis	0.27	1	0.603
	Log (A. calandrae density) × presence of H. prosopidis	1.42	1	0.233
Sex ratio of H. prosopidis	Log (host density)	1.72	1	0.190
	Log (A. calandrae density)	0.60	1	0.437
	Log (host density) × log (A. calandrae density)	3.02	1	0.082