It's UWAweek 25 (mid-year break)

helpOSTS

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 UWA week 20 (1st semester, week 11) ↓
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helpful
11:28am Sat 18th May, ANONYMOUS

I am unsure about whether all three predictors need to have values (inner join) when we join the three files, or if it is allowed to have empty values (outer join).

I think the text you quoted from the professor's email also answers the question.

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