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Should the kappa statistic be presented as a percentage? Explain.

Should the kappa statistic be presented as a percentage? Explain.

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No,kappa statistic can not be presented as a percentage as per its definition.

The definition of Kappa is given as:

where,

po is the relative observed agreement among raters and pe is the hypothetical probability of chance agreement, using the observed data to calculate the probabilities of each observer randomly seeing each category.

If the raters are in complete agreement then .

If there is no agreement among the raters other than what would be expected by chance .

It is possible for the kappa statistic to be negative, which implies that there is no effective agreement between the two raters or the agreement is worse than random.

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