[R] How to get the minimum ?

From: Philippe Lamy <plamy_at_daimi.au.dk>
Date: Thu 07 Jul 2005 - 19:37:15 EST


Hi,

I have a model with differents observations Xi. Each observation belongs to a group, either A or B. I would like to minimize a fonction like :

sum( Xi - Z)^2 + sum (Xi - aZ -b)^2

 A                B

The first sum contains all observations from group A and the second all observations from group B.
I want to find the Z-value wich minimize this function. a and b are predefined parameters.

Thanks for help.

Philippe



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