. Author manuscript; available in PMC: 2015 Jan 1.

Published in final edited form as: J Community Psychol. 2014 Jan;42(1):61–79. doi: 10.1002/jcop.21594

Table 5.

Neighborhood fixed effects model; Testing change in collective efficacy for families 2006, 2008, and 2010

	Unadjusted Model			Covariate-Adjusted Model
	Full		Reduced	Full		Reduced
Linear Effect of Year b(SE)	−.016(.046)		.031(.016)	−0.064(.045)		.001(.016)
Linear Effect of Year p-value	0.74		.05 ^#	0.16		0.93
R²	0.09		0.09	0.16		0.15
Joint F-Test of Interactions		1.17			1.36
p-value		0.22			.07 ^#
N		4907			4907

p<.10

p<.05

^**

p<.01

^***

p<.001

NOTES: Covariate-adjusted model adjusted for gender, age, race/ethnicity, foreign born status, education, income, neighborhood tenure, and home ownership. The F-test above is comparing a full model to a reduced model. The null hypothesis test is that the interaction terms do not significantly improve the model. In other words, the joint effect of the year*neighborhood interactions is equal to zero. The full model was estimated with post-estimation commands that give a sub-group analysis comparing, within each neighborhood, the effect of time on the construct of interest. The critical value with F(α=.05; df=37, 4907)=1.41. We tested for nonlinearity of year using a squared term and found no evidence of a non-linear effect of year.