Questions tagged [cohens-kappa]

A measure of the degree to which 2 raters agree. There is also a test of inter-rater agreement based on kappa. Use [inter-rater] if you are interested in other aspects of IRA, but not this specific measure.

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19 views

Accuracy, F-Score, and Kappa Together

What can accuracy, f-score, and kappa indicate together for a confusion matrix that each individually can't? I get F-Score and Accuracy measure to be quite close so I feel it should be sufficient for ...
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33 views

Hypothesis test on kappa

Problem: I am an electrical engineer and not a pro statistician. I have a classification problem and want to compare two classifiers using Cohence kappa metric. To calculate the kappa value, the ...
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26 views

Which Kappa to use in R to calculate agreement for binomial data (0 or 1) between two raters?

I have a dataset in which two raters (Human raters VS. ML model) assign "0" to pseudowords if they consider it as being masculine or "1" if they think they are feminine. So, it is ...
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9 views

How to evaluate differences in standard accuracy (PCC), Kappa, and AUC scores between random forest models?

I am using two sets of variables (life-history traits and human factors) to predict extinction Risk (Threatened/Non-Threatened) in turtles. In my first model (RF1 below) I only include life-history ...
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16 views

Inter rater agreement where categories are not predetermined

How can I measure inter-rater agreement, e.g., using the Kappa coefficient, during an exploratory study where the categories are not predetermined?
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64 views

Inclusion of a NA category in inter-rater agreement calculation

I have a dataset in which the behaviour of $n = 6$ subjects have been rated by $k = 84$ raters on an ordinal scale with 5 ordinal categories. The distances between the ordinal categories are not ...
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1answer
51 views

Significant Kappa coefficient with 95% CI spanning 0?

I'm using R's kappa2 function (irr package) to obtain Cohen's Kappa and the cohen.kappa ...
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14 views

Why does power not apply to Fleiss' Kappa Test and is there an equivalent concept? How do I know whether my sample size generates a valid result?

According to a comment on this blog post, Fleiss' Kappa is not a test and so therefore power does not apply to it. While this makes sense, there must be an equivalent concept, in the sense that the ...
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23 views

Estimating Irreducible error from kappa statistics for medical applications

In many medical applications that involve some form of classification the data is annotated by expert humans (e.g. histopathologists, radiologists). This is then taken as the ground-truth. However, it ...
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38 views

How to compute prevalence-adjusted bias-adjusted pooled kappa?

Hi I have a dataset of many codes and many chunks of data to code. Two coders have coded the data. I have read the pooled kappa paper and the PABAK paper. I know how to compute pooled kappa and I know ...
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17 views

n studies with multiple questions to be rated + minimum sample size for Cohen's Kappa using R

I'm new to Cohen's Kappa and have difficulty in trying to decide the right approach. So, I really appreciate if someone can guide me through this. Assuming I have 5 different studies (A-E) where I ...
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11 views

Kappa inter-rater agreement for large number of raters

I have 24 students rated by 9 different professors (we have a lot of professors) ...
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28 views

How to compare consistency between clustering results and list of values with different levels in R?

I found similar subjects on the website but I may have missed the relation with my own question. I'v seen questions about comparison of clustering results, but here it's more about comparing two lists ...
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10 views

Difficulties with agreement statistics and cohen's kappa

I have values of body compartments areas obtained through manual delineation using a dedicated medical software. We were two observers to perform the manual delineation and I am trying to assess the ...
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38 views

Test-Retest reliability with multiple raters on different subjects at different times

I want to be able to calculate the agreement between two ratings measured at two separate times. The rating is on a scale of 1-5. For example, the below data relates to 3 different "Rater"'s ...
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52 views

sample size for ICC and Fleiss' kappa

A study involves several continuous measurements and categorical observations (2-5 levels) from radiography images. Observations and measurements are taken by 4 or 5 readers(all readers read all ...
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41 views

How to calculate sample size estimation for fleiss kappa?

We have six categories that raters have to choose from. We have an intervention that should improve the rating quality. In previous studies the interobserver agreement is fleiss kappa 0.43 We expect ...
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19 views

Determining whether a rating scale is ordinal or nominal from data?

I am occasionally presented with data where a rating scale was used (i.e. options 1 through 5). Sometimes these are ordinal, e.g. Very positive. Somewhat positive Neutral Somewhat negative Very ...
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21 views

Help Performing Inter-Rater(Coder) Reliability in NVivo

I'm a student using the software NVivo 12 for Windows to perform qualitative coding on interview transcripts. One other person will be coding the same interviews independently so that we can perform ...
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14 views

0/1s in the diagonal of weight matrix when computing the weighted kappa

I am trying to compute the weighted kappa using quadratic weights (aka Fleiss-Cohen), but am getting extremely confused with the weights. I am able to compute these in R with no problem when using ...
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34 views

Inter-rater agreement after rater 1-based sampling

Rater 1 rated (+/-) some cases. Rater 2 gets to rate all the Rater 1 + cases, but only half of the rater 1 - cases. Is there a way to account for this sampling scheme when calculating inter-rater ...
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36 views

Different kappa results from kappa2() and CohenKappa()

I am trying to compute a weighted kappa with confidence intervals in R. I am having trouble understanding why the two functions, DescTools::CohenKappa and irr::kappa2, give different outputs. I need ...
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207 views

Calculating the Standard Error and Confidence Interval for Cohen's Quadratic Kappa

I need to evaluate the performance of a machine learning application. One of the evaluation metrics chosen is Cohen's Quadratic Kappa. I found this Python tutorial on how to calculate Cohen's ...
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21 views

How to compare inter-rater reliability between two time points?

We have two sets of raters judge the same items before and after a training, resulting in an ICC and kappa value for each time point (pre- and post-training). How would you statistically compare pre- ...
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23 views

Kappa for More than Two Classes in R?

I am building predictive models in R using the oil dataset which has 7 classes. I am wanting to use Kappa for optimization since the classes are extremely ...
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24 views

Multi-class inter-annotator agreement for overlapping time windows of annotations

My work involves a time series data of sensor measurements. I have a tool to annotate this dataset that allows annotators to flexibly add labels to varying time-windows. I have two annotators who have ...
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10 views

How to create two random variables with Kappa distribution with different Kurtosis?

I would like to generate two kappa random variables with the same mean, standard deviation, but with different Skewness and Kurtosis. Is there any ways to transform a dataset to increase/decrease the ...
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98 views

Cohen's Kappa using (irr) and kappa2() outputs z and p-value with NaN

I used the kappa2 function from the irr-library in R, however it returned an invalid z- and p-value and a kappa value of exactly 0. I already looked it up and stumbled upon this article Cohen's ...
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319 views

Cohen's Kappa for more than two categories

I have data set of teacher's evaluation rated by 4 different raters. The teacher's are evaluated for 13 different categories for example (Interaction with students, lesson delivery etc). All of the 4 ...
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161 views

Inter rater reliability with multiple raters, multiple categorical variables with different levels

Apologies if the answer to this question exists elsewhere, but I haven't found anything quite matching what I'm looking for. I have a dataset wherein 3 raters independently assessed 10 subjects by ...
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346 views

Fleiss' Kappa v. Cohen's Kappa v. Cronbach's Alpha

I am working on a project that compares two methods of assessing whether certain topics come up in a therapy session. I am comparing a checklist full of dichotomous (y/n) items completed by an ...
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24 views

Cohen Kappa Agreement By Chance

As Cohen's Kappa measure inter-rater agreement between two independent observer, it takes out the agreement by chance from observed agreement because there is always probability of random agreement ...
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23 views

sample size advice for matching nominal variables

I have two databases of patients and medications. Each database has the same patients. Both have millions of records. My job is to select a sample from each and confirm that the medications match. ...
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266 views

Is there a strict relation between Accuracy and Cohen's Kappa (measures of classification quality/agreement)?

Say I have two models (classifiers), $M_1$ and $M_2$, each with their own accuracy w.r.t. the ground truth, and I calculate also Cohen's Kappa between each model and the ground truth (as a measure of ...
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51 views

Nonparametric bootstrap to construct confidence intervals for Cohen's Kappa Coefficient

I was recently asked to perform nonparametric bootstrap to construct 95% confidence intervals for $\kappa$ using normal approximation, but I'm not sure how to do this. The only data I was given was ...
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1k views

Fleiss kappa vs Cohen kappa

Can somebody explain in-detailed differences between Fleiss kappa and Cohen kappa? And how the metric works under the hood? When would one use Fleiss kappa over Cohen kappa? What are the ...
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203 views

Find if there is a correlation between two paired data points

I have two lists of data with each 10 values from 10 participants. Let’s say the first list contains IQ’s of the 10 participants. And the second list contains how many words each 10 participants can ...
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42 views

weighted cohens kappa categories

I need to ask about how many categories can be included in a weighted kappa or cohens kappa statistic for inter observer reliability. Effectively we need to be reliable in assessing whether the ...
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45 views

Cohen's kappa and confounders

I'm interested in how certain factors affect the inter-rater reliability of two driving examiners (sitting in the back seats) in deciding whether to pass or fail the examinee. For example, age, ...
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37 views

Quadratic weighted kappa error

I have recently downloaded the extension for weighted kappa on SPSS. I followed the procedure of this video. However, at the end I have the following error "some ratings are not integers". Do you have ...
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151 views

Is it valid to report the mean of Cohen's kappa coefficients and the associated confidence intervals?

I am studying the interrater and intrarater reliability of a classification system (seven categories; nominal). I recruited 16 unique raters to classify 35 items according to the system. The raters ...
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293 views

Inter-rater agreement for non-fully crossed designs

I have a set of n subjects to be rated by i raters on a categorical scale that distinguishes k classes. Both the subjects and the raters are randomly sampled from a larger population of subject and ...
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171 views

Inter-rater agreement: number of raters vs. number of test subjects

I have a set of n texts. Each text is to be assigned a topic by i raters who choose the topic from a set of k discrete topic labels (A, B, C, ... K). So, for each text there are i ratings (categorical ...
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784 views

nltk multi_kappa (Davies and Fleiss) or alpha (Krippendorff)?

I'm using inter-rater agreement to evaluate the agreement in my rating dataset. I have a set of N examples distributed among M ...
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34 views

Cohen's kappa for agreements between two inter rater metrics?

I have two metrics for measuring source code cohesion. To verify that both have some agreement can I use Cohen kappa for that? Both the metrics have values in range [0 to 1]. It's not necessary if ...
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751 views

Interpretation of R output from Cohen's Kappa

I have the following result from carrying out Cohen's kappa in R ...
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52 views

Applying inter-rater reliability principles

Background: I want to perform a survey/questionnaire for a group of people with very different background and knowledge. Some of them are environmental scientists, anthropologists, and climate ...
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23 views

Measuring equivalence/reliability (ICC and consorts)

For a reliability study I’m administering patient reported outcomes (questionnaires) with 2 modes of administration (on paper and via an electronic device). I’d like to measure equivalence/reliability ...
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94 views

Cohen's Kappa in R versus SPSS

I was working with R and SPSS trying to determine Cohen's Kappa for a dataset. I decided to test the two and see if they would end up getting the same numbers. However, they did not. I was wondering ...
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Demonstrating improved agreement on clinical decision making using the Kappa coefficient

I have a large number of respiratory doctors - some from University hospitals and some from community non-academic hospitals. They have been asked to evaluate 60 patients with various different lung ...