sorry - I was a bit too fast writing. didn't see the "access the aim..." sentece :) "Heureka" <[EMAIL PROTECTED]> wrote in message SYAi9.9341$[EMAIL PROTECTED]">news:SYAi9.9341$[EMAIL PROTECTED]... > Hi > > I don't believe it is posible to get a good estimate of Y as you know > nothing about it. Knowing that X is correlated with Y doesn't help much > except if you know HOW they are correlated! > > I'm relatively new in this field, so please correct me if I'm wrong! > > Thomas > > > "Alan Miller" <[EMAIL PROTECTED]> wrote in message > q9ui9.25102$[EMAIL PROTECTED]">news:q9ui9.25102$[EMAIL PROTECTED]... > > "Helen" <[EMAIL PROTECTED]> wrote in message > > news:amdk8r$9j8$[EMAIL PROTECTED]... > > > Hi there > > > > > > I have two random vector X (X1,X2,...,Xn) and Y (Y1,Y2,...,Yn) > > > I know there are correlated, now I have already known pdf of X, > > > what kind of ways could I get the pdf of Y? > > > And to access this aim, what kind of other information( maybe > > > covariance matrix etc.) should I know? > > > I am now building a model for my research, so I wanna get some clue > > > about that. > > > > > > Thanks a lot! > > > > > > > > > > For fairly narrow bands of X-values, I would like to look at histograms of > > the corresponding Y-values. You may find that, say, the means and std. > > deviations both increase roughly linearly with the mean of the X-values. > > You may find that the shape of the histogram may look roughly the same for > > each group, but just moved. > > > > The most comprehensive book I know on bivariate distributions is: > > Hutchinson, T.P. and Lai, C.D. (1991) `The Engineering Statistician's > Guide > > to Continuous Bivariate Distributions', published by Rumsby Scientific > > Publishing. > > ISBN 0 646 02413 2 > > Chapter 15 `How to understand bivariate data' attempts to answer questions > > such as yours. > > The book is highly mathematical, and much of it is devoted to cataloging a > > large number of bivariate distributions. > > > > Cheers > > > > -- > > Alan Miller > > http://users.bigpond.net.au/amiller > > Retired Statistician > > > > > > > > >
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