kappa

 KAPPA estimates Cohen's kappa coefficient
   and related statistics 

 [...] = kappa(d1,d2);
    NaN's are handled as missing values and are ignored
 [...] = kappa(d1,d2,'notIgnoreNAN');
    NaN's are handled as just another Label.
 [kap,sd,H,z,ACC,sACC,MI] = kappa(...);
 X = kappa(...);

 d1    data of scorer 1 
 d2    data of scorer 2 

 kap    Cohen's kappa coefficient point
 se    standard error of the kappa estimate
 H    Concordance matrix, i.e. confusion matrix
 z    z-score
 ACC    overall agreement (accuracy) 
 sACC    specific accuracy 
 MI     Mutual information or transfer information (in [bits])
 X     is a struct containing all the fields above

 Reference(s):
 [1] Cohen, J. (1960). A coefficient of agreement for nominal scales. Educational and Psychological Measurement, 20, 37-46.
 [2] J Bortz, GA Lienert (1998) Kurzgefasste Statistik f|r die klassische Forschung, Springer Berlin - Heidelberg. 
        Kapitel 6: Uebereinstimmungsmasze fuer subjektive Merkmalsurteile. p. 265-270.
 [3] http://www.cmis.csiro.au/Fiona.Evans/personal/msc/html/chapter3.html
 [4] Kraemer, H. C. (1982). Kappa coefficient. In S. Kotz and N. L. Johnson (Eds.), 
        Encyclopedia of Statistical Sciences. New York: John Wiley & Sons.
 [5] http://ourworld.compuserve.com/homepages/jsuebersax/kappa.htm