[R] How to get the minimum ?
Philippe Lamy
plamy at daimi.au.dk
Thu Jul 7 11:37:15 CEST 2005
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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