| ci.kappa {statpsych} | R Documentation |
Confidence interval for a kappa reliability
Description
Computes a confidence interval for the intraclass kappa coefficient and Cohen's kappa coefficient for two dichotomous ratings. Both measures are intraclass reliability coefficients.
Usage
ci.kappa(alpha, f00, f01, f10, f11)
Arguments
alpha |
alpha level for 1-alpha confidence |
f00 |
number of objects rated y = 0 and x = 0 |
f01 |
number of objects rated y = 0 and x = 1 |
f10 |
number of objects rated y = 1 and x = 0 |
f11 |
number of objects rated y = 1 and x = 1 |
Value
Returns a 2-row matrix. The results in row 1 are for the intraclass kappa. The results in row 2 are for Cohen's kappa. The columns are:
Estimate - estimate of interrater reliability
SE - standard error
LL - lower limit of the confidence interval
UL - upper limit of the confidence interval
References
Fleiss JL, Paik MC (2003). Statistical Methods for Rates and Proportions, 3rd edition. Wiley.
Examples
ci.kappa(.05, 31, 12, 4, 58)
# Should return:
# Estimate SE LL UL
# IC kappa: 0.6736597 0.07479965 0.5270551 0.8202643
# Cohen kappa: 0.6756757 0.07344761 0.5317210 0.8196303