Estimating decay rates of single-frequency causal AR filters using a "Decimation" method

A method of analysis will be presented which is both efficient and accurate when applied to the problem of estimating decay rate of single-frequency weakly damped causal AR filters. The method relies on using D disjoint subsets of the original data set. A subset is formed by taking values of the original data at a sample rate, D, and these subsets cover the original data set. This D is called the "decimation" rate and the approach is called the decimation" method.