As the first answer to this question, we propose to measure the affinity in morphological type by considering the sets of morphological features attested within each of the UD treebanks.
3 for each pair of a source language set M S and a target language set M T , we estimate their Jaccard index, which is defined for two sets as the cardinality of their intersection divided by the cardinality of their union, as shown in Equation 4.