Oster (2005) argued that parents with Hepatitis B (HBV) have more sons, which explained Asia's "missing women". Lin and Luoh (2008) show no relationship between gender and mother's HBV. We test for a relationship between paternal HBV and son share and find none.

In this paper we derive test statistics based on Double-Length Regressions (DLRs) for testing functional forms and spatial error dependence. These DLR tests are computationally simple. Their Monte Carlo performance is similar to that of the Hessian-based Lagrangian Multiplier tests.

We demonstrate theoretically and illustrate the implications of assuming power utility when the true function is of the expo-power form. Empirical results can appear to be consistent with cumulative prospect theory when they are in fact generated from a Markowitz model.

The piecewise power value function proposed by Kahneman and Tversky is inconsistent with both theoretical and experimental work. We propose the expo-power function as an alternative to the power function and examine its ability to explain choices in Allais experiments.