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.

Filter by
Sorted by
Tagged with
0
votes
0answers
22 views

All Good But Low Kappa

In my experiment, everything looks fine except the Kappa because the Accuracy is very close to the Random Accuracy. For example, True Positive = 70689 False Negative = 16098 False Positive = 55 True ...
3
votes
0answers
23 views

Accuracy assessment for multinomial probabilities

I am working on a classification problem where the input data are multinational proportions for each point, with $m$>2 groups. And the outcome is likewise a multinomial proportion for that point. ...
0
votes
0answers
18 views

Kappa coefficient for variable number of raters

I want to calculate the Inter-rater Reliability of an annotated dataset, where the number of raters for each subject is variable (3-5 raters) and subjects can be annotated with one of 7 categories. ...
1
vote
0answers
28 views

How to get Kappa and MCC from nested cross-validation?

Let's take this well known example. How could I get the Kappa score and the Matthews correlation coefficient from nested cross-validation? I've tried to make it with ...
0
votes
1answer
15 views

Unable to calculate kappa or weighted kappa when 1+ raters give the same rating to everyone — what is a good solution?

Are there alternate inter-rater reliability statistical tests one can perform in cases where a rater gives the same rating to everyone? SPSS is unable to return a kappa or weighted kappa value when ...
0
votes
1answer
18 views

Inter-rater reliability for multiple raters for one item (subject)

I have data with 3 raters, each of whom rated 3 items as follows: item a item b item c rater 1 a1 b1 c1 rater 2 a2 b2 c2 rater 3 a3 b3 c3 I successfully calculated the inter-rater reliability for ...
1
vote
1answer
11 views

Calculating inter-rater reliability with 1 primary rater and a couple other secondary raters

I'm trying to figure out what to use to calculate inter-rater reliability for a set of behavioral coding. There's one individual codes the whole set (primary coder; e.g. codes data ID 1-300) and a few ...
0
votes
1answer
9 views

Rotating raters and kappa - appropriate statistic?

I have a several hundred x-rays. Each case is reviewed by 2 of 5 raters and assigned a categorical severity (Mild/Moderate/Severe). So similar data I expect might look like: ...
0
votes
0answers
10 views

How to select dichotomous variables?

I have a data set of 57 dichotomous items that constitute a scale for measuring a particular condition. I also have another dichotomous variable of the condition itself. I would like to do some factor ...
0
votes
1answer
32 views

Inter annotator agreement (or disagreement) for highly imbalance annotations?

I have a time-series dataset which is annotated by 4 individual annotators where I have following things in annotations. Its possible that one annotator has not annotated all samples (i.e. missing ...
1
vote
0answers
20 views

How to determine agreement between two sets?

I have two sets of Ids both drawn from the same background. I'd like to know the appropriate way to compare their similarity. Set A and B are often significantly different in length eg. ...
0
votes
0answers
20 views

Combining two independent annotator agreements

We have 4 annotators that are going to manually classify 500 text data, and we want to compute the inter-annotator agreement scores. We think that the best way to do it is just to ask each of the four ...
0
votes
0answers
12 views

Cohens Kappa for multiple categories

I have a data set of two observers evaluating 50 patient xrays. We are evaluating hip replacement femoral stem loosening by gruen zone, meaning a single patient may have more than one zone of ...
0
votes
1answer
34 views

Why doesn't it make sense to measure agreement with Chi square?

Why is it more useful to calculate Cohen's Kappa instead of the Pearson Chi Square test to measure the interrater agreement? Could someone please give me an example?
1
vote
2answers
106 views

Testing the significant difference between 4 kappa values in one test

This question is about comparing the significant difference between accuracy metrics (that can be derived from a confusion matrix) calculated for four different models. I have four unsupervised change ...
2
votes
1answer
56 views

Can pearson's correlation coefficient be converted to Cohen's kappa?

I'm interested in meta-analysing the agreement between two measures. Depending on whether the variables are continuous/categorical/binary, different studies present agreement as either: A Pearson's ...
0
votes
0answers
34 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 ...
1
vote
1answer
43 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 ...
0
votes
0answers
35 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 ...
0
votes
0answers
14 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 ...
1
vote
0answers
19 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?
2
votes
1answer
77 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 ...
3
votes
2answers
160 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 ...
0
votes
0answers
33 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 ...
2
votes
0answers
26 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 ...
0
votes
0answers
64 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 ...
0
votes
0answers
18 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 ...
0
votes
0answers
12 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) ...
1
vote
0answers
61 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 ...
0
votes
0answers
11 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 ...
0
votes
0answers
80 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 ...
0
votes
0answers
131 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 ...
0
votes
0answers
82 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 ...
1
vote
0answers
25 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 ...
1
vote
2answers
36 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 ...
0
votes
1answer
51 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 ...
1
vote
1answer
398 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 ...
1
vote
0answers
37 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- ...
1
vote
1answer
179 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 ...
0
votes
1answer
638 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 ...
2
votes
1answer
336 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 ...
1
vote
1answer
611 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 ...
0
votes
0answers
24 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. ...
3
votes
2answers
357 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 ...
0
votes
1answer
66 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 ...
6
votes
1answer
2k 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 ...
2
votes
2answers
310 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 ...
1
vote
1answer
49 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 ...
1
vote
1answer
53 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, ...
1
vote
1answer
44 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 ...