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I want to use the Fisher Scoring Algorithm in Newton-Raphson method.
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I(theta_m) in above that calculated at each iteration, has to be positive definite? Is it possible this matrix be indefinite?

user321525
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    Does this answer your question? [Is it possible Fisher information matrix be indefinite?](https://stats.stackexchange.com/questions/527029/is-it-possible-fisher-information-matrix-be-indefinite) – microhaus Jun 02 '21 at 20:25
  • Can you please explain how this is different from the question you asked earlier today? – Arya McCarthy Jun 02 '21 at 21:59

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