x- and z-indices, and indicators of the CWTS and SCIMAGO group in universities of decreasing research excellence.

The x-index is calculated from the mean of the yearly values of N1 and N0.1 from 2003 to 2007, and the z-index is the x-index divided by the mean of the number of national articles in these years. MNCS2-CPPFCSm indicators of the CWTS of the Leiden University (http://www.socialsciences.leiden.edu/cwts/) and Field Normalized Citation Score of SCIMAGO (http://www.scimagoir.com/).