For univariate regression on mcycle data set we suggest

As far as univariate regression on mcycle data set is concerned, the results of likelihood ratio test in the last three columns indicate that the LPQR approach can not give an accurate conditional quantile prediction at the upper or lower quantile. While the values of NS for SVQR and SVWQR are all zeros. This performance indicates that both the SVQR and SVWQR approaches always keep good performance in each replication.