Help using Base SAS procedures

How does HPGENSELECT estimate the dispersion parameter?

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How does HPGENSELECT estimate the dispersion parameter?

It uses ML, restricted ML or method of moments? I think GENMOD uses ML to estimate it. SCALE=DEVIANCE or PEARSON is provided in GENMOD to treat dispersion differently. Can one still use DEVIANCE or PEARSON scale in HPGENSELECT?

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