Financial ratios are often used in principal component analysis and related techniques for the purposes of data reduction and visualization. Besides the dependence of results on ratio choice, ratios themselves pose a number of problems when subjected to a principal component analysis, such as...

Casas et al. (J Happiness Stud 9(2):197–205, <CitationRef CitationID="CR8">2008</CitationRef>) found no significant relationship between paired answers given by parents and their 12–16-year-old children (N = 266) for a single-item scale on overall life satisfaction (OLS). However, a significant, but low (.19) parent–child...</citationref>

Our purpose in this article is to define a network structure which is based on two egos instead of the egocentered (one ego) or the complete network (n egos). We describe the characteristics and properties for this kind of network which we call “nosduocentered network”, comparing it with...