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Old 01-04-2006, 12:58 PM
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Gandalf Gandalf is offline
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You only integrate over values where the density is positive. E.g., suppose you are considering the marginal density of y = .7. You don't want to include the point (.1, .7) since that is not within the shaded part of his diagram. The lowest value of x that has any density when y = .7 is x = .35.
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