Dear R group,
I have to solve a hessian matrix 40*40, called M, in order to obtain the standart deviations of estimators.
When I use the function solve(M), I have the following error message: "Error in solve.default(M) : Lapack routine dgesv: system is exactly singular"
Do you know an alternative approach which could succeed? I have found some information about the function "ginv" (library MASS), has someone already used it in such a situation?
Thank you very much for your responses.
Eve MATHIEU.
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