Kappa {PresenceAbsence}

Kappa

Description

Kappa calculates Kappa and (optionally) the associated standard deviation from a confusion matrix.

Usage

Kappa(CMX, st.dev = TRUE)

Arguments

CMX

a confusion matrix - output from cmx

st.dev

a logical indicating whether the associated standard deviation should be calculated

Details

The Kappa statistic summarizes all the available information in the confusion matrix. Kappa measures the proportion of correctly classified units after accounting for the probability of chance agreement.

Value

if st.dev = FALSE, returns: Kappa.

if st.dev = TRUE, returns a dataframe where:

[1,1]	Kappa
[1,2]	Kappa.sd	standard deviation of Kappa

Author(s)

Elizabeth Freeman [e-mail]

See Also

cmx, pcc, sensitivity, specificity, auc

Examples

data(SIM3DATA)

Kappa(cmx(SIM3DATA))

Kappa(cmx(SIM3DATA),st.dev=FALSE)