Question: Continuing the previous problem, explore whether the beta for these companies changes through time. For example, are the betas based on 1990s data different from

Continuing the previous problem, explore whether the beta for these companies changes through time. For example, are the betas based on 1990s data different from those based on 2000s data? Or are data based on only five years of data different from those based on longer time periods?

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