An Engagement Model Based on User Interest and QoS in Video Streaming Systems

Table 3

Correlation coefficients of user engagement with QoS and user interest, respectively. The values of the QoS metrics are measured in logarithmic scale. The correlation coefficient of user engagement with user interest will be introduced in Section 5.2, while those with QoS metrics are introduced in Section 5.1.

Correlation metric	Buffer ratio	Buffer frequency	Average buffer length	Startup delay	Interest
Pearson	-0.2363	-0.3332	-0.0985	-0.1195	0.3374
Spearman	-0.2273	-0.3435	-0.1034	-0.1447	0.3595