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Feb 24, 2017 12:19 PM
(625 views)

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Feb 27, 2017 7:37 AM
(1141 views)

Solution

From the JMP Help:

"The option Show Normal 50% Contours shows areas that contain roughly 50% of the points for that group if the assumptions are correct. Under linear discriminant analysis, they are all the same size and shape."

My additions:

Assumptions: a normal distribution with common covariance for the two groups.

Remember that the ellipse is an ESTIMATE based on the model. It is not a guarantee of having 50% of the observations within the ellipse.

Dan Obermiller

1 REPLY

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Feb 27, 2017 7:37 AM
(1142 views)

From the JMP Help:

"The option Show Normal 50% Contours shows areas that contain roughly 50% of the points for that group if the assumptions are correct. Under linear discriminant analysis, they are all the same size and shape."

My additions:

Assumptions: a normal distribution with common covariance for the two groups.

Remember that the ellipse is an ESTIMATE based on the model. It is not a guarantee of having 50% of the observations within the ellipse.

Dan Obermiller