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May 29, 2017 at 8:18 comment added Pere @Mamba Added an edit. It might be understood in other ways, but understanding it as Y=constant makes the second part of the problem to make sense.
May 29, 2017 at 8:16 history edited Pere CC BY-SA 3.0
**Edit:** "Regress $Y_i$ exclusively on the intercept", as I understand it, means fitting a model $Y=a$ (with $a$ constant). Adjusting this model using least squares yields just $Y=mean(Y)$.
May 29, 2017 at 4:37 comment added Mamba Hi @Pere thank your for that answer. I still cant figure out what it means to regress Y or X exclusively on the intercept.
May 28, 2017 at 10:25 history answered Pere CC BY-SA 3.0