ci.kappa {statpsych}

Confidence interval for two kappa reliability coefficients

Description

Computes confidence intervals for the intraclass kappa coefficient and Cohen's kappa coefficient with two dichotomous ratings.

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