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Calculating the Kappa Coefficient for 3 Observations by 2 Observers

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The kappa coefficient (or kappa statistic) is a measure of agreement between 2 observers interpreting data. It measures the ratio of the actual agreement between observers beyond chance divided by the potential agreement beyond chance. The number of observation choices may range from two or more. In this section we will calculate the kappa statistic when there are 3 possible interpretations per observation, giving a 3x3 table.

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