Question: The function gls() from the package nlme will fit one of the classical econometric regression models, the linear regression model yi = x > i

The function gls() from the package nlme will fit one of the classical econometric regression models, the linear regression model yi = x > i β + εi with AR(1) disturbances, εi = φεi−1 + νi , where νi ∼ (0, σ2 ν ) i.i.d. and |φ| < 1, albeit by maximum likelihood, not by least-squares techniques. Select one of the firms from the Grunfeld data and estimate this model. What is the amount of first-order autocorrelation?

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