© 1973 by Biometrika Trust
On the bias of autoregressive approximations to moving averages
State University of New York at Buffalo
A rather extensive empirical study of autoregressive approximations to first-order moving averages, and in particular their use in estimating the moving average coefficient, shows a significant bias to be present. This is of special importance now that autoregressive spectral estimators are becoming popular. Several conjectures are made about the cause of bias, and some procedures are developed to reduce this bias.
Key Words: Moving average process Autoregressive process Bias