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Student Support Forum: 'Multivariate Box-Cox transformations' topicStudent Support Forum > General > "Multivariate Box-Cox transformations"

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David Paul
05/10/00 05:47am

I am writing some code to transform bivariate skewed data to approximate multivariate normality using Box-Cox transformations.

It has been no real problem to write functions/procedures which work on bivariate data. However, I have had difficulty figuring out how to extend my functions to handle data of any dimension. Part of this has to do with using the FindMinimum[f,{x,x0},...] command on the LogLikelihood function.

If I know that the data is bivariate in advance, then I simply use FindMinimum[-LogLikelihood,{x,x0},{y,y0}] and obtain the parameter estimates. How do I extend this to data of any dimension? My problem is in figuring out how to specify the {x,x0},{y,y0},... initial starting points, since I don't want to make assumptions about how many dimensions=starting points I need in advance.

Thanks! -Dave

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