Question: For the insomnia example in Section 12.4.2, according to SAS the maximized log likelihood equals 593.0, compared to 621.0 for the simpler model

For the insomnia example in Section 12.4.2, according to SAS the maximized log likelihood equals – 593.0, compared to – 621.0 for the simpler model forcing σ = 0. Compare models, using either a likelihood-ratio test or AIC. What do you conclude?

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