A Statistical Model for Diagnosing Zygosis by Ridge-Count

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Abstract
On the assumption that dermal ridge-count is normally distributed with a constant within-egg variance and a constant between-egg variance, a statistical model for the use of ridge-count in conjunction with other criteria for diagnosing zygosis is developed. The ridge-count normality assumption is tested and found to account fairly well for variations in available twin data. The utility of the model is such that parameters derived from twin data can be used for higher order births as well.

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