I am trying to replicate the Hoston, Laubach & Williams model. I followed the procedure outlined in the paper (WP version attached), initializing with the values they estimated (see .xls attached). I get sensible results for the autoregressive parameteres but much lower ones for those linking the output gap with the interest rate gap in the 1st equation and inflation with the lagged output gap in the 2nd equation, and above all, for the variance of the state variables. Moreover, the estimates are not stable even though the likelihood is maximized (i.e. if I reestimate the model I get very different estimates).
Any clue? Please find enclosed the workfile.
Thanks a lot.
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