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I am analysing time series data right now using gretl, and want to test for a structural break, but I am not quite sure how I have to interpret the results.

Let's say I have a wheat price and flour price, and I'm doing a VECM. Without a structural break my ECM is -0.12, so it's correcting 12%. When I do the Chow test, I break the time series in half and I get the coefficients 1: -.115 and 2: -0.072.

Does that mean that in the first half the ECM is correcting with 11.5% and in the second half with 7.2%?

Are the results reliable when only one coefficient is significant?

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