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I have a contingency table of data for the twelve months of the year (i.e., a 2 x 12 table), and I want to evaluate the difference between two particular months (the probability of their values being what they are).

If I want to use the chi-square test to evaluate this, what data for the expected values should I use? The data from all 12 months or the data from only this 2 x 2 sub-contingency table?

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