why is it less accurate than methods specifically developed for classification what is ac curve for cluster what is ac curve which technique is used to group test instances with and without class labels? where is the area under roc curve used what is the area under a roc curve which of the following is used to classify test instances using the use of clustering techniques? what is a auc how are clustered clusters used what is ac curve what is the auc curve which class is most accurate a.u.c. what is the accuracy how can we classify a test instance why is the auc curve less accurate what is the auc? how accurate is a class clustering which technique is the most accurate what is the auc curve used for why is the cluster method less accurate than