Introduction

The Online Kappa Calculator can be used to calculate kappa--a chance-adjusted measure of agreement--for any number of cases, categories, or raters. Two variations of kappa are provided: Siegel and Castellan's (1988) fixed-marginal multirater kappa and Randolph's free-marginal multirater kappa (see Randolph, 2005; Warrens, 2010). Brennan and Prediger (1981) suggest using free-marginal kappa when raters are not forced to assign a certain number of cases to each category and using fixed-marginal kappa when they are. Values of kappa can range from -1.0 to 1.0, with -1.0 indicating perfect disagreement below chance, 0.0 indicating agreement equal to chance, and 1.0 indicating perfect agreement above chance. A rule of thumb is that a kappa of .70 or above indicates adequate interrater agreement.

Instructions

First, specify the number of cases, categories, and raters then click on "Show table." A table will appear with cases in rows and categories in columns. Then, in the empty cells, input the number of raters who agreed that a certain case belongs to a certain category. Do not leave any empty cells; input a zero if no raters agreed that a case belonged to that category. The sum of each row should equal the number of raters. You can cut and paste data from most spreadsheet software.

More Info

See the following articles for more information on the formulas used here:

Brennan, R. L., & Prediger, D. J. (1981). Coefficient Kappa: Some uses, misuses, and alternatives. Educational and Psychological Measurement (41), 687-699.
Warrens, M. J. (2010). Inequalities between multi-rater kappas. Advances in Data Analysis and Classification. Advance online publication. doi:10.1007/s11634-010-0073-4
Randolph, J. J. (2005). Free-marginal multirater kappa: An alternative to Fleiss´ fixed-marginal multirater kappa. Paper presented at the Joensuu University Learning and Instruction Symposium 2005, Joensuu, Finland, October 14-15th, 2005. (ERIC Document Reproduction Service No. ED490661)
Siegel, S., & Castellan, (1988). Nonparametric statistics for the social sciences, (2nd ed.). New York: McGraw-Hill.

This site was dreamt up and commissioned by Justus Randolph original java version designed and programmed by Walubengo M. Singoro (2008). HTML and Javascript port programmed by Alexander Cole (2016).

Please cite as: Randolph, J. J. (2008). Online Kappa Calculator [Computer software]. Retrieved from http://justus.randolph.name/kappa

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