A note on the application of the Oakes' identity to obtain the observed information matrix of hidden Markov models

Details A note on the application of the Oakes' identity to obtain the observed information matrix of hidden Markov models A note on the application of the Oakes' identity to obtain the observed information matrix of hidden Markov models

2012-01-28

arxiv.org/abs/1201.5990v1

Mathematics

Statistics Theory

Scientific paper

We derive the observed information matrix of hidden Markov models by the application of the Oakes (1999)'s identity. The method only requires the first derivative of the forward-backward recursions of Baum and Welch (1970), instead of the second derivative of the forward recursion, which is required within the approach of Lystig and Hughes (2002). The method is illustrated by an example based on the analysis of a longitudinal dataset which is well known in sociology.

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