Ok
But problem is that the negative values is in diagonal elements. Diagonals elements of covariance matrix is \sigma^2. So I get that errors of functions coefficients \sigma is imaginary.
Hello
I had measured luminescence decay profile. Then I want to fit a function which would approximate my experimental date. For that I make a simple program in LabWiev. The problem is that, that program give me out a negative values in covariance matrix. Why that?
P.S.
Sorry for my English