calculate David's scores
square interaction matrix with winner in rows and losers in columns, for example the output from
the type of dyadic win proportion to be use. By default corrected for number of interactions in a dyad, otherwise the raw proportion
a data.frame with columns ID, DS (David's scores) and normDS (normalized David's scores)
David, H. A. 1987. Ranking from unbalanced paired-comparison data. Biometrika, 74, 432-436.
Gammell, M. P., de Vries, H., Jennings, D. J., Carlin, C. M. and Hayden, T. J. 2003. David's score: a more appropriate dominance ranking method than Clutton-Brock et al.'s index. Animal Behaviour, 66, 601-605.
de Vries, H., Stevens, J. M. G. and Vervaecke, H. 2006. Measuring and testing the steepness of dominance hierarchies. Animal Behaviour, 71, 585-592.
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