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These models included the survey as a categorical variable whose fixed effects were estimated with least squares means and a random-effects term to account for clustering by US Census tractdefined neighborhood

It explains how R.J

And the younger they were when they started such experimenting, the greater the risk

[DOI] [PubMed] [Google Scholar] 22

No information is available about sampling protocols adopted in ABS price surveys

One argument against them says that its not the governments place to tell people how they should or should not treat their bodies
