Conventional wisdom holds that scientists' receptivity to new ideas declines as they age. This proposition, known as `Planck's Principle', has typically been studied using logit models which do not control for censored data. To see if this potential problem affects the results, we have re-tested the proposition, using data from an earlier study with a semi-parametric hazard rate model that controls for censored data. We find that the earlier studies' refutation of Planck's Principle is robust to this variation in econometric method.
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