Help using Base SAS procedures

a question for panel data

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a question for panel data

I am using Proc panel to regress an unbalanced panel data. I wonder before doing random effect vs fixed effect choice, do I need check heteroskedasticity and autocorrelation? If I need test them, which options in proc panel can help to correct them? Some people say proc panel can automatically give the best estimate. Is it true? Thank you.
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