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4 results for “from:Jean Sun”

what does the sum of square of Gaussian RVs with different variance obey?
Jean Sun · Sep 22, 2003 · r-help

>From basic statistics principle,we know,given several i.i.d Gaussian RVs with zero or nonzero mean,the sum of square of them is a central or noncentral Chi-distributed RV.However if these Gaussian RVs have different variances...

about parameter fitting of Gld(Generalized Lambda Distribution)
Jean Sun · Oct 17, 2003 · r-help

Currently, I am intrested in parameter fitting of "Generalized Lambda Distribution".And I have found two packages in R related to Gld,Davies and gld. What's a pity that no method in Davies deals with fitting of gld,and...

what does the sum of square of Gaussian RVs with differentvariance obey?
Jean Sun · Sep 23, 2003 · r-help

Thanks a lot. It does work. The fitted data match the simulated ones well. Even no need the shifted or scaled version of Chi-squared pdf. Also, I have tested the case of non-independent RVs,generated by linear combining...

A statistical problem.Anybody can help me?
Jean Sun · Apr 16, 2003 · r-help

A doubt: Multiplying together the characteristics functions is available only if all a(i)|R(i)| is independent,i think.However, obviously, that is not true herein. I will try the methods you mentioned.Thanks a lot! 2003-04-14...

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