Regression Results for Maintenance Expense Changes
Model: DExpt = b0 + b1DExpt–1 + et
	Coefficients	Standard Error	t-Statistic	p-value
Intercept	1.3304	0.0089	112.2849	< 0.0001
Lag-1	0.1817	0.0061	30.0125	< 0.0001

Lagged Residual Autocorrelations for Maintenance Expense Changes
Lag	Autocorrelation	t-Statistic	Lag	Autocorrelation	t-Statistic
1	−0.239	−2.39	7	−0.018	−0.18
2	−0.278	−2.78	8	−0.033	−0.33
3	−0.045	−0.45	9	0.261	2.61
4	−0.033	−0.33	10	−0.060	−0.60
5	−0.180	−1.80	11	0.212	2.12
6	−0.110	−1.10	12	0.022	0.22