TD-ARMA coefficients estimation. Estimation of the TD-ARMA(1,1) coefficients of the Human gene 276. The TD-ARMA(1,1) model is given by x [n] + a [n - 1] x [n - 1] = w [n] + b [n - 1] w [n - 1]. The blue and black (resp. red and green) curves depict the time series a[n] (resp. b[n]) for the coding and non-coding regions of the gene, respectively.