Question: 14.2 Cross-validation uses in-sample observations. How does it estimate the MSPE for out-of-sample observations, even though the econometrician does not have those observations?

14.2 Cross-validation uses in-sample observations. How does it estimate the MSPE for out-of-sample observations, even though the econometrician does not have those observations?

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Cross-validation uses in-sample observations. How does it estimate the MSPE for out-of-sample observations, even though the econometrician does not have those observations?

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