Infeasible GLS a. requires too much memory even for today's PCs.
b. uses complicated interative techniques.
c. cannot be calculated since it also uses quasi differences for $X _ { t }$.
d. assumes the parameters of the error autocorrelation process to be known.

Question

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The Answer of Infeasible GLS a. requires too much memory even for today's PCs.
b. uses complicated interative techniques.
c. cannot be calculated since it also uses quasi differences for $X _ { t }$.
d. assumes the parameters of the error autocorrelation process to be known.

Infeasible GLS A XtX _ { t }Xt​ D Assumes the Parameters of the Error Autocorrelation Process to PCs

Infeasible GLS A $X _ { t }$
D Assumes the Parameters of the Error Autocorrelation Process to PCs