How to construct the instrument matrix of arellano-bond dynamic panel data in matlab?

Firstly, I want to use Arellano-bond dynamic estimator (First-difference GMM) to estimate a nonlinear model in Matlab. And my dataset is unbalanced panel data. However, I have no idea how to construct the instrument matrix for this unbalanced panel dataset. Anyone has experiences in doing this?
many thanks

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on 23 Dec 2014

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