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gfit error message in generalized Pareto (GP) distribution

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wave_buoys
wave_buoys 2019-1-7
编辑： wave_buoys 2019-5-3
Hello,
I compute return period using gpfit (Generalized Pareto parameter estimates) to calculate the return period, while I calculate the maximum likehood, I got an error message below.
Warning: Maximum likelihood has converged to an estimate of K < -1/2.
Confidence intervals and standard errors can not be computed reliably.> In gpfit (line 124)
I guess this happens with small values in the inputs, but I have no idea how to sort it out. Could you please help????
Thanks

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