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Wendy Crewson
07-12-2006, 11:59 AM
Hi. Would anyone shed some light on a symbol that popped up on the NEAS Module Four practice problems? It is a small case "y", sub i, with a hat. The notation has been a little sketchy for this course. Thanks so much.

Kazodev
07-12-2006, 12:16 PM
Hi. Would anyone shed some light on a symbol that popped up on the NEAS Module Four practice problems? It is a small case "y", sub i, with a hat. The notation has been a little sketchy for this course. Thanks so much.
Doesn't that stand for residual?

Wendy Crewson
07-12-2006, 01:45 PM
The residual is given by capital Y with a hat. That is why I was confused about the small case "y".

Kazodev
07-12-2006, 01:56 PM
The residual is given by capital Y with a hat. That is why I was confused about the small case "y".
When I was learning regression in stats, \hat{Y_i} refers to a i-th vector of residuals, not sure if that's the case here.

bmathew22
07-12-2006, 05:00 PM
Maybe the RSS, regression sum of squares? Sum(yhat-yhatbar)^2

Wendy Crewson
07-12-2006, 05:21 PM
The small "y" with the hat is the fitted value of y in deviations form.

Thanks everybody. Keep in touch.