Introduction to Modern Bayesian Econometrics
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There is a bug in the WinBUGS syntax interpreter that may in some circumstances lead to incorrect interpretation of the following syntax:
... + (b - c) ... may be interpreted as - b + c
... - (b + c) ... may be interpreted as b - c
... - (b - c) ... may be interpreted as - b - c
Users should check their models for the existence of these structures: essentially a bracket including a sum or difference of random quantities with a negative sign either inside or outside the bracket. It is perhaps most likely to occur in complex non-linear regression models. If suspicious, try rewriting the expression in an equivalent form but without the bracket, then running a few iterations to check it was being evaluated appropriately.
This is clearly very serious, and we are trying to get a patch sorted out as quickly as possible. In the meantime users are advised to check any models they use for the occurence of this particular structure.