Un nuovo indice di associazione: applicazione al paradosso di Simpson

P. Scozzafava
In the study of association between two dicotomic variables A and B, in presence of a third variable C, it is possible to derive some relations involving the relative frequencies of data. These relations, when we put together data ignoring the third variable C , permit to avoid changes in the sign of the index measuring this association (Simpson Paradox). They have been analysed in detail by geometric approach which provides also an evaluation of...