Possibly the wisest fortune cookie ever:
Image may be NSFW.
Clik here to view.
…and definitely clearer than “E[Yi | Di=1] - E[Yi | Di=0] ≠ E[Y1i | D1i=1] - E[Y1i | D0i=1]” and related statements.
Possibly the wisest fortune cookie ever:
Image may be NSFW.
Clik here to view.
…and definitely clearer than “E[Yi | Di=1] - E[Yi | Di=0] ≠ E[Y1i | D1i=1] - E[Y1i | D0i=1]” and related statements.