where Star Madurai
Student denotes the expected QoS value of service
j observed by user Star Students Madurai
is the predicted QoS value, and N is the number of predicted
values. However, since the Star Student
Madurai object of this paper is to predict service
QoS ranking instead of predicting QoS values, we Star
Projects Centre Madurai
employ the Normalized Discounted Cumulative Gain NDCG Star
Project Centre Madurai
metric, which is a popular metric for evaluating ranking results.
Given an ideal service QoS ranking Star Projects
Center Madurai used as ground truth
Star Project Center Madurai
and a predicted QoS ranking, the Star Project
Madurai NDCG value of the Top-K ranked services can
be Star Projects Madurai
calculated by