diagnostic

Six psychiatrists classified 30 patients into 5 diagnostic categories.

datasets

The kappa statistic implemented by Fleiss is a very popular index for assessing the reliability of agreement among multiple observers. It is used both in the psychological and in the psychiatric field. Other fields of application are typically medicine, biology and engineering. Unfortunately,the kappa statistic may behave inconsistently in case of strong agreement between raters, since this index assumes lower values than it would have been expected. We propose a modification kappa implemented by Fleiss in case of nominal and ordinal variables. Monte Carlo simulations are used both to testing statistical hypotheses and to calculating percentile bootstrap confidence intervals based on proposed statistic in case of nominal and ordinal data.

Daniele Giardiello

raters

A Modification of Fleiss' Kappa in Case of Nominal and Ordinal
Variables

Piero Quatto

Enrico Ripamonti

Stefano Vigliani

diagnostic function

A matrix with 30 rows and 5 columns.<dl>
 <dt><code>Depression</code></dt>
<dd>number of psychiatrists who judged a given patient affected by &#8220;Depression&#8221;</dd> <dt><code>Personality disorders</code></dt>
<dd>number of psychiatrists who judged a given patient affected by &#8220;Personality disorders&#8221;</dd> <dt><code>Schizophrenia</code></dt>
<dd>number of psychiatrists who judged a given patient affected by &#8220;Schizophrenia&#8221;</dd> <dt><code>Neurosis</code></dt>
<dd>number of psychiatrists who judged a given patient affected by &#8220;Neurosis&#8221;</dd> <dt><code>Other</code></dt>
<dd>number of psychiatrists who judged a given patient affected by &#8220;Other&#8221; diseases</dd>
</dl>

Format

Frequency of assignment of patients to diagnostic categories — diagnostic

A matrix with 30 rows and 5 columns.<dl>
 <dt><code>Depression</code></dt>
<dd>number of psychiatrists who judged a given patient affected by &#8220;Depression&#8221;</dd>

 <dt><code>Personality disorders</code></dt>
<dd>number of psychiatrists who judged a given patient affected by &#8220;Personality disorders&#8221;</dd>

 <dt><code>Schizophrenia</code></dt>
<dd>number of psychiatrists who judged a given patient affected by &#8220;Schizophrenia&#8221;</dd>

 <dt><code>Neurosis</code></dt>
<dd>number of psychiatrists who judged a given patient affected by &#8220;Neurosis&#8221;</dd>

 <dt><code>Other</code></dt>
<dd>number of psychiatrists who judged a given patient affected by &#8220;Other&#8221; diseases</dd>


</dl>

diagnostic: Frequency of assignment of patients to diagnostic categories

Description

Usage

Arguments

Format

References