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. 2014 Oct 20;16(10):e236. doi: 10.2196/jmir.3416

Table 3.

Augmented Dickey-Fuller (ADF) test of ILI^a, Twitter, and Google search query data with first order lag.

		ΔILI^b		ΔTwitter infection^b		ΔGoogle search query^b
		t statistic^c	probability	t statistic^c	probability	t statistic^c	probability
ADF test		−12.544	0.000	−19.358	0.000	−6.920	0.000
Test critical values
	1% level	−3.463		−3.463		−3.463
	5% level	−2.876		−2.876		−2.876
	10% level	−2.574		−2.574		−2.574
		Stationary		Stationary		Stationary

^aILI: influenza-like illness

^bΔ=first order lag

^cDegrees of freedom=202