The characteristic line of a security or portfolio relates its rate of return to that of a "market portfolio." Several investigators have suggested the desirability of obtaining such a line by ...

Sir Francis Galton found the vox populi by averaging the voices of individuals. When farmers estimated the weight of an ox at a country fair, the average of their estimates was more accurate than the ...

We consider a unified least absolute deviation estimator for stationary and nonstationary fractionally integrated autoregressive moving average models with conditional heteroscedasticity. Its ...