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Percent Agreement (%agree)
Percent agreement is frequently used in assessing quality of the data… but it is not a good estimator of precision unless there is 100% agreement! For example, if there was 60% agreement, this does not describe the error in the 40% of samples where estimates did not agree: are 40% of the samples plus or minus one year, or several? Conversely, a percent agreement of 0% in a sample of old fish (>50yrs) could be quite acceptable if all of the estimates were only a few years off! If used at age reading labs, percent agreement is often used with underlying assumptions that the estimates in disagreement were not seriously different.
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