A Kappa value function

I am a first timer and very new to this forum, so forgive me if I fail to appropriately address certain issues. I am in the process of designing a database that requires a Kappa function value for statistical comparison between observers. This value, if you don't already know, gives the point value for comparing between observers when evaluating data. I have a frequency of 10 steps (or 11 values) for each observer. Each observer chooses one of the values per evaluating session. These values are then opened into a matrix giving the agreement (e.g. 1,1;2,2;3,3;etc.) and disagreement (e.g. 1,2;1,3;1,11;2,3;etc.) values. The totals are then produced from the agreements and disagreements. A Kappa value (weighted or unweighted) is determined through other software. I would like to incorporate this Kappa function into a script within the FileMaker database. Can anyone familiar with statistical formulae point me in the right direction?