A new wavelet-based nonparametric estimator is introduced in an effort to approximate variance functions. The new estimator possesses some superior qualities that are illustrated through its actual performance in some simulations. Citation Copyright 2000 by Kluwer Academic Publishers.

A new wavelet-based estimator is introduced which combines the state-space model with the wavelet transform in an effort to explore the stock market inefficiency. The new estimator possesses some superior qualities that are illustrated through its actual performance in forecasting the S&P 500....

A design is called feasible if all the ANOVA parameters in it are estimable. This paper provides a simple method to judge the feasibility of a design using matrix image. Furthermore, a broad family of feasible designs is obtained.

In this empirical study, we test the relationship of Chinese urban productivity and city size. Using over 119 790 firm-level production data cross 28 industries from the Third National Industrial Survey, along with the urban population data of 224 cities, we find strong and prevailing...