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Hi!

in case an equation does not have estimates (e.g. because a nonlinear model failed to converge), what are the "values" in eqn.@coef() ? a blank string or zero or na?
I'm not interested in ways to overcome the non-convergence which lead to the non-existing estimates. I would just like to include an IF statement in my program to find out what the "nature" of the estimates is (i.e. numbers, as expected, or something else, like a blank string etc.).

Thanks!

~~Alois

If the equation doesn't have estimates, accessing any of the data members will result in an error (which you could trap to check whether it does have estimates or not).

Note that nonconvergence of a nonlinear estimation procedure will still produce estimates.