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
1 answer
24 views

What metrics work well in unbalanced assemblies?

I wanted to know if there are some metrics that work well when working with an unbalanced dataset. I know that accuracy is a very bad metric when evaluating a classifier when the data is unbalanced ...
user avatar
1 vote
2 answers
35 views

Calculating Cohen's Kappa in SPSS for a systematic review

I'm sure there's a simple answer to this but I haven't been able to find it yet. All the explanations I've found to calculate Cohen's Kappa in SPSS use data that is formatted with cases that are ...
user avatar
  • 13
0 votes
1 answer
10 views

When is it more appropriate to use linear or quadratic weights to measure inter-rater reliability (Fleiss's kappa or Gwet's AC1?) [duplicate]

I am analysing the results of a linguistic acceptability judgment study where 36 speakers had to rate a finite number of sentences on a 7-point Likert scale (so an ordinal scale, although I am not ...
user avatar
0 votes
1 answer
35 views

Inter Annotator Agreement for Question Answering

I would like to run an Inter Annotator Agreement (IAA) test for Question Answering. I've tried to look for a method to do it, but I wasn't able to get exactly what I need. I've read that there are ...
user avatar
0 votes
0 answers
21 views

How to test whether there is a statistically significant difference in agreement(Cohen's kappa) between 2 or more independent groups?

I have 2 methods to compare by difference in race. For example I want to test the agreement between Method 1 and Method 2 between Asians, Americans and Africans. I know how to calculate kappa ...
user avatar
  • 1
0 votes
0 answers
24 views

What is the correct inter-rater reliability measure for 2 raters annotating video frames with one of 3 categories?

In my problem, two raters are given 30 videos. For the videos each second will be annotated with one of 3 categories (A making an error, B making an error, no error). For instance, a video could be ...
user avatar
0 votes
0 answers
23 views

Comparing classification metrics among studies

I am doing some comparison of classification results obtained by various studies using machine learning. All studies use the same "type" of data (satellite imagery) but differ in many ...
user avatar
  • 21
0 votes
0 answers
59 views

How to compare two Kappa values based on the same sample but different methods (two new methods A and B, and a gold standard method C)

Now, I have two assessment methods A and B (both of them are new methods) for assessing diabetes. Moreover, the method C is the gold standard. Firstly, I ask a rater (Raters X) to use Method A and C (...
user avatar
0 votes
0 answers
14 views

Proper metric to compare continuous to discrete data? [duplicate]

I have two measurements of the same thing. The first is a subjective rating score, the second is a quantitative metric. The rating score is discrete (0-10), while the quantitative metric is any value ...
user avatar
0 votes
0 answers
22 views

Can I use Scott's pi (kappa unbiased) instead of Cohen's kappa for multi-class classification?

I am doing a 3-class time series classification task, where classes are 0, 1 and 2. I calculated the confusion matrix by using Python's PyCM library. I heard that kappa is the most important metrics ...
user avatar
0 votes
0 answers
37 views

Can Fleiss' Kappa test the agreement of three different parameters?

I have a question about statistics. I have a question about the kappa coefficient. I think this coefficient is used for rater reliability. However, is it possible to test the consistency change of two ...
user avatar
0 votes
0 answers
29 views

Calculate the mean and the variance of the Kappa statistic

The Kappa statistic was defined as following: $\kappa = \displaystyle\frac{p_o-p_e}{1-p_e}$, where $ p_o = \displaystyle\sum_{i=1}^{k} p_{ii}$ is the observed agreement, and $p_c = \displaystyle\sum_{...
user avatar
0 votes
0 answers
9 views

Kappa Agreement analysis for two related classifications

We conducted an experiment where participants compare a metric map and sketch map of the same area. In the sketch map, they are asked to classify generalized (yellow) and non-generalized (green)...
user avatar
  • 1
0 votes
0 answers
19 views

IRR Cohen's Kappa Shiny R

I'm needing to make a shiny app to calculate Cohen's Kappa for a series of different circumstances in the context of interviewers ratings of an interviewee, so after the interview the managers can ...
user avatar
0 votes
0 answers
24 views

What measure of agreeement should I use for time series data?

I am trying to compare the agreement between two measurements. Each measurement tells me when a device is worn or not worn (binary) and is sampled at the same frequency (1Hz). The measurements were ...
user avatar
1 vote
0 answers
21 views

Calculating the quality of text parsing script

I have a python script that picks relevant sentences from a text corpus based on keywords and stopwords and applies some classifiers for the chosen sentences. The context is academic research. The ...
user avatar
  • 11
1 vote
1 answer
43 views

Weighted Kappa with rating variables that have different set of categories

I want to measure the inter-agreement rate between two physicians that rated the same set of images with two different methods (rater1 used method1, rater2 used method2) BUT Rater1 rated the the ...
user avatar
  • 457
0 votes
0 answers
12 views

Assessing Consistency and Agreement of Two Groups of Raters in an ordinal dataset

I'm using a real dataset of convenience to look at one group of subjects who are being assessed for "frailty". The goal is to see whether assessments by non-experts are comparable to experts....
user avatar
  • 1
0 votes
0 answers
36 views

How can I tell if my classifier is significantly better than chance?

I have a fairly rubbish classifier for a task assigning samples to one of the classes {i, e, l, g}. I would like to know whether it's actually better than random. All the discussion that I can find is ...
user avatar
1 vote
0 answers
50 views

How to assess inter-rater reliability when you have multiple observations (and thus ratings) per participant?

I am trying to calculate inter-rater reliability for my data. I have multiple participants and multiple responses per participant. Each participant provided a list of responses, which will then be ...
user avatar
0 votes
0 answers
38 views

interrater reliability alternatives to kappa

I have applied a binary classifier to a raster. Within the raster, I have "ground" truth plots where pixels have been manually assigned to one of the two classes. I would like to assess the ...
user avatar
0 votes
0 answers
28 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 ...
user avatar
3 votes
0 answers
45 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. ...
user avatar
0 votes
0 answers
65 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. ...
user avatar
  • 1
1 vote
0 answers
217 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 ...
user avatar
0 votes
1 answer
128 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 ...
user avatar
0 votes
1 answer
78 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 ...
user avatar
1 vote
1 answer
22 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 ...
user avatar
0 votes
1 answer
19 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: ...
user avatar
  • 3
0 votes
0 answers
12 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 ...
user avatar
  • 2,680
0 votes
1 answer
343 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 ...
user avatar
  • 1
1 vote
0 answers
73 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. ...
user avatar
  • 11
0 votes
1 answer
221 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?
user avatar
  • 35
1 vote
2 answers
478 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 ...
user avatar
  • 113
2 votes
1 answer
253 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 ...
user avatar
  • 135
0 votes
0 answers
105 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 ...
user avatar
1 vote
1 answer
68 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 ...
user avatar
  • 11
0 votes
0 answers
72 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 ...
user avatar
1 vote
0 answers
24 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?
user avatar
2 votes
1 answer
158 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 ...
user avatar
  • 75
3 votes
2 answers
605 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 ...
user avatar
3 votes
0 answers
32 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 ...
user avatar
  • 539
1 vote
0 answers
127 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 ...
user avatar
  • 11
1 vote
0 answers
141 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 ...
user avatar
  • 133
1 vote
0 answers
51 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 ...
user avatar
  • 14.5k
1 vote
2 answers
37 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 ...
user avatar
  • 111
0 votes
1 answer
113 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 ...
user avatar
  • 57
1 vote
1 answer
768 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 ...
user avatar
1 vote
0 answers
63 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- ...
user avatar
  • 21
1 vote
1 answer
347 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 ...
user avatar