We fitted AR(2) models to the mean corrected lake data using the Yule–Walker equations and Burg’s…

We fitted AR(2) models to the mean corrected lake data using the Yule–Walker equations and Burg’s algorithm. If instead we fit an ARMA(1,1) model using the innovations method in the option Model>Estimation>Preliminary of ITSM (with the default value = 17), we obtain the model Xt− 0.7234Xt−1 = Zt+ 0.3596Zt−1{Zt} ∼ WN(00.4757), for the mean-corrected series XtYt− 9.0041. The ratio of the two coefficient estimates  width= and  width= to 1.96 times their estimated standard deviations are given by ITSM as 3.2064 and 1.8513, respectively. The corresponding 95% confidence intervals are therefore

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