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We estimate the model parameters and the influence of candidate explanatory variables (gender, digit ratio and handedness) on the probability of delaying gratification as follows:(1)where πi is the probability of failing to delay gratification for child i; βj is the coefficient vector capturing the impact of changes in the explanatory variables on πi; g is a dummy for gender (female = 0; male = 1); di is the 2D:4D digit ratio for child i; h is a dummy for handedness (left- handed = 0; right-handed = 1); and εi is an error term.
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