Table 7 Robustness test results.

Configuration	M0		M1 (Remove “popularity”)		M2 (10% of users in both positive and negative emotion)		M3 (8% of users in both positive and negative emotion)
Configuration	Coefficient	P value	Coefficient	P value	Coefficient	P value	Coefficient	P value
mutual	6.845	0.000***	6.846	0.000***	6.846	0.000***	6.845	0.000***
professional_status	0.238	0.000***	0.236	0.000***	0.236	0.000***	0.235	0.000***
honorary_status	0.551	0.000***	0.546	0.000***	0.544	0.000***	0.548	0.000***
medical_ip	0.081	0.002**	0.084	0.001**	0.082	0.001**	0.085	0.001**
profile	0.089	0.004**	0.090	0.003**	0.086	0.005**	0.083	0.006**
effort	0.736	0.000***	0.766	0.000***	0.736	0.000***	0.743	0.000***
Popularity	0.056	0.192			0.049	0.249	0.047	0.271
emotion_negative	0.556	0.164	0.550	0.191	0.669	0.102	0.774	0.057
emotion_positive	0.515	0.198	0.514	0.221	0.553	0.177	0.456	0.263
emotion_neutral	0.904	0.023*	0.903	0.030*	0.836	0.040*	0.832	0.040*

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