Convert moult scores obtained for single feathers into overall proportion of feather mass grown.
vector of moult scores. Ideally, each moult score is a character string of one individual's individual feather moult scores, each between 0 and 5, e.g. "555444000" if only nine primaries are of interest.
vector of relative feather mass, corresponding to each feather in ms.
ms will usually be a vector of 9 or 10 primary feather scores,
but single feathers can be given, in which case
is ignored. The method used here assumes that a moult score of 1 for
any feather corresponds to 1/8th of the feather grown, 2
corresponds to 3/8th = 0.375, etc.. The proportion of feather mass
grown is then a weighted sum over all feathers, with weights
equal to the relative weight (compared to the total weight) of each
feather (Underhill and Zucchini 1988).
ms2pfmg returns a single value between 0 and 1: proportion of
total feather mass grown.
Bo T. Bonnevie
Underhill, L. G. and Zucchini, W. (1988) A model for avian primary moult. Ibis 130, 358–372.
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