Mico Loretan

A Note on the Coefficient of Determination in Models with Infinite Variance Variables

Since the seminal work of Mandelbrot (1963), alpha-stable distributions with infinite variance have been regarded as a more realistic distributional assumption than the normal distribution for some economic variables, especially financial data. After providing a brief survey of theoretical results on estimation and hypothesis testing in regression models with infinite-variance variables, we examine the statistical properties of the coefficient of determination in models with alpha-stable variables. If the regressor and error term share the same index of stability alpha

Exchange Rate Fluctuations and International Portfolio Rebalancing in Thailand

We present empirical evidence that the Thai baht’s value is driven in part by investors’ cross-border equity portfolio rebalancing decisions. Our results are based on comprehensive datasets of FX and stock market transactions undertaken by nonresident investors in Thailand in 2005 and 2006. Higher returns in the stock market relative to a reference stock market are associated with net sales of equities by these investors and a depreciation of the Thai baht. Net purchases of Thai equities lead to an appreciation of the Thai baht. Foreign investors do not appear to hedge the foreign exchange risk related to their stock market positions.