cohens_kappa: Calculate Cohen's Kappa

In cutpointr: Determine and Evaluate Optimal Cutpoints in Binary Classification Tasks

Calculate Cohen's Kappa

Description

Calculate the Kappa metric from true positives, false positives, true negatives and false negatives. The inputs must be vectors of equal length.

mrg_a = ((tp + fn) * (tp + fp)) / (tp + fn + fp + tn)
mrg_b = ((fp + tn) * (fn + tn)) / (tp + fn + fp + tn)
expec_agree = (mrg_a + mrg_b) / (tp + fn + fp + tn)
obs_agree = (tp + tn) / (tp + fn + fp + tn)
cohens_kappa = (obs_agree - expec_agree) / (1 - expec_agree)

Usage

cohens_kappa(tp, fp, tn, fn, ...)

Arguments

tp	(numeric) number of true positives.
fp	(numeric) number of false positives.
tn	(numeric) number of true negatives.
fn	(numeric) number of false negatives.
...	for capturing additional arguments passed by method.

Value

A numeric matrix with the column name "cohens_kappa".

See Also

Other metric functions: F1_score(), Jaccard(), abs_d_ppv_npv(), abs_d_sens_spec(), accuracy(), cutpoint(), false_omission_rate(), metric_constrain(), misclassification_cost(), npv(), odds_ratio(), p_chisquared(), plr(), ppv(), precision(), prod_ppv_npv(), prod_sens_spec(), recall(), risk_ratio(), roc01(), sensitivity(), specificity(), sum_ppv_npv(), sum_sens_spec(), total_utility(), tpr(), tp(), youden()

Examples

cohens_kappa(10, 5, 20, 10)
cohens_kappa(c(10, 8), c(5, 7), c(20, 12), c(10, 18))

cutpointr documentation built on April 14, 2022, 1:06 a.m.