. Author manuscript; available in PMC: 2017 Aug 22.

Published in final edited form as: CSCW Conf Comput Support Coop Work. 2017 Feb-Mar;2017:1334–1349. doi: 10.1145/2998181.2998219

Table 4.

Results of multivariate Granger causality tests for different MFP and Twitter measures in forecasting future diet compliance success/failure.

	Baseline			CalDiff			CalDiff:25			CalDiff:50			PropDays:50			PropDays:75

	λ	F-stat	p	λ	F-stat	p	λ	F-stat	p	λ	F-stat	p	λ	F-stat	p	λ	F-stat	p
Diet compliance measures

past success	0.49	4.44	^***	0.27	4.58	^***	0.32	5.92	^***	0.33	4.30	^***	0.33	4.15	^***	0.26	3.72	^***
calorie consumption	0.24	5.64	^***	0.51	3.87	^***	0.41	4.94	^***	0.23	6.18	^***	0.58	4.45	^***	0.44	5.60	^***

Affective attributes

PA	0.05	5.65	^***	0.51	5	^***	0.33	6.27	^***	0.78	3.87	^**	0.51	5.88	^***	0.2	5.13	^***
NA	0.65	3.01	^**	0.16	3.86	^**	0.1	4.56	^***	0.31	3.39	^**	0.41	6.82	^***	0.25	4.52	^***
anger	0.58	5.69	^***	0.24	3.79	^**	0.13	5.08	^***	0.77	4.99	^***	0.16	3.08	^**	0.66	6.4	^***
anxiety	0.06	5.31	^***	0.23	5.87	^***	0.06	3.36	^**	0.77	6.49	^***	0.54	5.3	^***	0.5	3.39	^**
sadness	0.07	5.02	^***	0.79	6.14	^***	0.64	6.65	^***	0.29	5.78	^***	0.36	6.34	^***	0.51	3.16	^**
swear	0.75	0.73	-	0.75	2.01	^**	0.9	1.57	^*	0.98	1.7	^*	0.79	1.88	^*	0.91	0.66	-

Cognitive attributes

Cognition

cognitive_mech	0.73	4.25	^***	0.08	5.24	^***	0.44	4.27	^***	0.52	3.23	^**	0.21	6.24	^***	0.77	6.39	^***
discrepancies	0.84	2.27	^**	0.74	0.8	-	0.76	0.56	-	0.89	1.99	^*	0.87	1.1	-	0.82	2.88	^**
negation	0.92	0.23		0.84	0.69	-	0.8	0.9	-	0.91	0.5	-	0.91	1.76	^*	0.71	0.92	-
inhibition	0.44	4.96	^***	0.48	5.9	^***	0.52	4.27	^***	0.78	5.15	^***	0.31	6.96	^***	0.32	5.39	^***
causation	0.86	0.97	-	0.76	2.99	^**	0.93	0.13		0.75	1.6	^*	0.83	0.65	-	0.77	1.35	^*
certainty	0.55	6.52	^***	0.36	5.87	^***	0.4	4.71	^***	0.14	4.4	^***	0.14	5.08	^***	0.8	3.52	^**
tentativeness	0.81	2.15	^**	0.97	1.21		0.84	0.62	-	0.89	0.36		0.82	0.1		0.72	1.2	^*

Perception

see	0.32	5.5	^***	0.1	3.51	^**	0.79	3.08	^**	0.76	4.11	^***	0.68	6.59	^***	0.43	6.96	^***
hear	0.15	5.41	^***	0.06	3.62	^**	0.36	5.65	^***	0.59	6.91	^***	0.06	5.13	^***	0.25	6.94	^***
feel	0.09	4.86	^***	0.33	6.69	^***	0.64	5.53	^***	0.59	4.67	^***	0.08	6.27	^***	0.27	4	^**
percept	0.33	5.4	^***	0.05	5.19	^***	0.38	5.78	^***	0.18	3.54	^**	0.55	6.79	^***	0.18	3.12	^**
insight	0.74	2.12	^**	0.89	1.9	^*	0.77	0.09		0.89	1.37	^*	0.92	2.44	^**	0.77	2.11	^**
relative	0.72	1.55	^*	0.87	1.39	^*	0.9	2.46	^**	0.76	1.75	^*	0.99	0.87	-	0.7	2.83	^**

Lexical Density

verbs	0.24	6.63	^***	0.35	6.63	^***	0.3	6.44	^***	0.26	3.15	^**	0.71	6.83	^***	0.02	5.23	^***
auxiliary verbs	0.26	3.29	^**	0.6	3.83	^**	0.6	5.72	^***	0.07	5.46	^***	0.12	3.58	^**	0.19	6.01	^***
adverbs	0.81	2.84	^**	0.89	2.55	^**	0.83	1.47	^*	0.86	2.31	^**	0.89	2.83	^**	0.78	1.7	^*
prepositions	0.96	2.54	^**	0.79	2.71	^**	0.91	0.61	-	0.98	1.56	^*	0.78	2.85	^**	0.86	1.06	-
conjunctions	0.99	0.85	-	0.81	0.36		0.83	1.45	^*	0.74	1.88	^*	0.98	1	-	0.82	1.61	^*
articles	0.72	4.84	^***	0.52	6.6	^***	0.32	4.27	^***	0.8	5.62	^***	0.42	4.37	^***	0.7	5.35	^***
inclusive	0.91	0.57	-	0.94	2.9	^**	0.91	2.2	^**	0.95	2.1	^**	0.73	1.61	^*	0.95	2.54	^**
exclusive	0.79	2.37	^**	0.75	0.52	-	0.79	2.24	^**	0.78	2.68	^**	0.85	0.5	-	0.87	2.82	^**

Temporal references

past tense	0.09	3.5	^**	0.01	5.58	^***	0.26	4.89	^***	0.02	3.2	^**	0.73	3.43	^**	0.25	3.29	^**
present tense	0.2	4.69	^***	0.48	6.24	^***	0.64	5.13	^***	0.58	3.64	^**	0.74	5.14	^***	0.07	6.11	^***
future tense	0.68	5.1	^***	0.74	6.41	^***	0.31	5.8	^***	0.39	3.32	^**	0.46	5.9	^***	0.09	6.36	^***

Social/Personal Concerns

family	0.68	6.48	^***	0.69	5.27	^***	0.15	6.97	^***	0.27	5.66	^***	0.68	6.55	^***	0.43	6.54	^***
friends	0.71	6.73	^***	0.23	3.19	^**	0.13	5.21	^***	0.6	5.04	^***	0.63	4.39	^***	0.55	5.33	^***
social	0.56	6.86	^***	0.37	4.22	^***	0.5	6.55	^***	0.75	3.46	^**	0.32	4.42	^***	0.35	5.14	^***
work	0.83	1.28	^*	1	0.6	-	0.92	1.42	^*	0.88	2.02	^**	0.74	2.15	^**	0.95	1.52	^*
health	0.79	3.19	^**	0.55	6.23	^***	0.67	6.18	^***	0.64	6.91	^***	0.53	5.98	^***	0.04	3.53	^**
humans	0.91	1.85	^*	0.8	2.62	^**	0.88	0.01		0.94	1.27	^*	0.78	2.68	^**	0.93	2.7	^**
religion	0.92	2.92	^**	0.97	1.97	^*	0.76	2.06	^**	0.92	2.68	^**	0.98	2.38	^**	0.91	0.34
bio	0.86	1.69	^*	0.75	0.33		0.98	1.9	^*	0.74	2.83	^**	0.73	1.44	^*	0.77	2.76	^**
body	0.04	5.84	^***	0.43	3.21	^**	0.06	3.68	-	0.34	4.02	^***	0.28	4.37	^***	0.07	3.98	^**
money	0.94	1.8	^*	0.86	0.31		0.74	0.61	-	0.85	0.57	-	0.95	0.63	-	0.82	0.17
achievement	0.25	3.45	^**	0.07	4.66	^***	0.41	6.64	^***	0.75	5.68	^***	0.6	4.14	^***	0.12	3.82	^**
home	0.83	2.83	^**	0.78	0.89	-	0.82	0.08		0.73	0.01		0.78	0.79	-	0.71	0.88	-
sexual	0.99	1.01	-	0.84	0.65	-	0.71	2.81	^**	0.85	1.94	^*	0.86	0.54	-	0.82	1.28	^*
death	0.74	2.88	^**	0.7	0.57	-	0.77	1.82	^*	0.77	1.97	^*	0.71	1.63		0.82	1.07	-

Interpersonal awareness

1st p. singular	0.48	5.79	^***	0.33	3.04	^**	0.16	6.63	^***	0.75	3.84	^**	0.56	5.63	^***	0.27	6.36	^***
1st p. plural	0.12	3.69	^**	0.25	4.76	^***	0.7	4.72	^***	0.64	4.14	^***	0.25	5.38	^***	0.7	3.19	^**
2nd p.	0.69	4.06	^***	0.48	4.28	^***	0.63	5.58	^***	0.35	6.14	^***	0.39	6.98	^***	0.07	6.06	^***
3rd p.	0.9	2.57	^**	0.71	0.88	-	0.77	0.46		0.94	2.83	^**	0.81	2.5	^**	0.96	2.2	^**

Activity

Interactivity	0.67	6.05	^***	0.53	6.9	^***	0.73	3.89	^**	0.03	3.03	^**	0.13	5.89	^***	0.05	4.67	^***
Information sharing	0.33	6.44	^***	0.41	5.38	^***	0.59	5.28	^***	0.53	5.73	^***	0.22	6.28	^***	0.34	5.05	^***

Social capital

# inlinks	0.8	4.4	^***	0.03	3.3	^**	0.55	5.43	^***	0.04	3.85	^**	0.61	6.02	^***	0.6	4.74	^***
# outlinks	0.04	5.74	^***	0.5	4.69	^***	0.61	6.51	^***	0.55	3.04	^**	0.56	5.56	^***	0.11	6.77	^***

For each measure, we report the Wilks’ λ (likelihood ratio) statistic, Rao’s approximate F statistic, and the p value (−: p = .05; *: p = .01; **: p = .001; and ***: p = .0001). Results are shown for all six diet compliance metrics. Grey rows indicate measures for which none of the diet compliance predictions yielded Granger significance at p = .0001 level.