Displaying 20 results from an estimated 1000 matches similar to: "Multi-response, multi-rater kappa?"
2012 Feb 01
1
Function to compute multi-response, multi-rater kappa?
I'm looking for a function in R that extends kappa to multiple raters when
there is more than one response per subject. For example, say a group of
doctors have to assign diseases to patients. Each patient will be assigned
one to many diseases, and the number of doctors assigning diseases to any
one patient will be two to many.
Here's an extremely simple example of the type of data I
2013 Jan 11
0
Weighted Kappa for m Raters
Hello, I have 50 raters and 180 cases which are rated as malignant, probably malignant, probably benign, and benign. I want to compare all the raters but I want a weighted kappa to penalize differences between malignant and benign more than differences between malignant and probably malignant. I only found the weighted option in the 2-rater functions (kappa2, wkappa, cohen.kappa). The
2007 Jun 26
3
inter-rater agreement index kappa
Is there a function that calculates the inter-rater agreement index
(kappa) in R?
Thanks ../Murli
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2008 Oct 31
1
stratified kappa (measure agreement or interrater reliability)?
Hi All:
Could anyone point me to a package that can calculate stratified kappa? My
design is like this, 4 raters, 30 types of diagnosis scores, 20 patients.
Each rater will rate each patient for each type of diagnosis score. The
rater's value is nominal.
I know I can measure the agreement between raters for each type of diagnosis
score, e.g., calculate out 30 kappa values. My problem is I
2009 Jul 13
3
Help With Fleiss Kappa
Hi All,
I am using fleiss kappa for inter rater agreement. Are there any know
issues with Fleiss kappa calculation in R? Even when I supply mock data
with total agreement among the raters I do not get a kappa value of 1.
instead I am getting negative values.
I am using the irr package version 0.70
Any help is much appreciated.
Thanks and Regards
M
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2009 Jul 13
0
Fleiss Kappa
Hello Everyone
I am calculating Fleiss Kappa, I have 28 raters, 5 Subjects and 5 ratings.
The problem is that there are 2 missing values in the data.
Would it better to replace those with "0" or should those be omitted? By
omission I will be left wit only 3 subjects.
and my second problem is that overall agreement comes to zero, whereas the
data is not showing agreement to be close
2009 Sep 25
1
simulating a model
Dear useRs,
I have written an ecological model, based on the epidemiology SIR model.
I've been trying to simulate it in R.
However, I can't simulate it properly.
Two guesses: my script isn't right; I'm not setting the parameters properly
I have uploaded an image to the model here:
http://img24.imageshack.us/img24/743/imagemutr.jpg
The script I am using is as it follows:
2010 Aug 10
3
sapply/lapply instead of loop
Using the input below, can I do something more elegant (and more efficient)
than the loop also listed below to pad strings to a width of 5? The true
matrix is about 300K rows and 31 columns.
#######################
#INPUT
#######################
> temp
DX1 DX2 DX3
1 13761 8125 49178
2 63371 v75 22237
3 51745 77703 93500
4 64081 32826 v72
5 78477 43828 87645
>
2006 Apr 28
1
Where do I find Cohen´s kappa???
Hello,
I?m looking for a way to measure the goodness of fit of my model with Cohen?s Kappa (scaling between 0 and 1).
The kappa function does not give the results I?m looking for. Heres the code:
z<-glm(x~y,binomial)
kappa(z, exact = T)
Does anyone know more?
many thanks
Christian
--
_______________________________________________
Search for businesses by name, location, or phone number.
2003 Oct 23
2
OOP like handling of lists?
Hello,
I am writing a package with a collection of several models. In order to
allow users to play interactively with the models (in contrast to
hacking lengthy scripts), I want to put all what is needed to run a
particular model into a single list object for each model.
Then there will be a collection of functions to run the model or to
modify parameters, time steps, integration method ...,
2006 Feb 09
2
latent class modle for rater agreement
Hello there,
I would like to test the agreement amongst 6 raters for nominal data on
a scale from 1-4, and conduct a latent class analysis in R. How should
the data be formatted and what code should I use?
Thank you very much
Lisa Wang
Princess Margaret Hospital
Biostatistics
tel:416 946 4501
2001 Apr 19
2
Multiple linear regression
Dear R-users,
I've a question regardiing multiple linear regression.
Is it possible to regress a function of the type
y=b0+b1*x1+b2*x2
constraining the partial derivatives dy/dx1 and dy/dx2 to be greater
than 0 ???
Thank you very much for any possible suggestion.
Best regards
Marco
--
Marco Pagani - PhD Student
Dipartimento di Scienze della Terra - Sezione Geofisica
Universita' degli
2008 Aug 22
3
simple generation of artificial data with defined features
Dear R-colleagues,
I am quite a newbie to R fighting my stupidity to solve a probably quite
simple problem of generating artificial data with defined features.
I am conducting a study of inter-observer-agreement in
child-bronchoscopy. One of the most important measures is Kappa
according to Fleiss, which is very comfortable available in R through
the irr-package.
Unfortunately medical doctors
2009 Dec 22
1
Cohen's kappa, unequal score ranges
Hi,
I am having problems getting cohen's kappa to work. I have been using the function:
><-ckappa(x,y)
from the psy package.
I am trying to test for inter-observer reliability, I have 2 observers and 26 categories, however, the two observers might not necessarily have the same range of categories (I have unequal score ranges). However, I thought R could cope with this.
Each time I
2006 Dec 11
1
cohen kappa for two-way table
Greetings,
I am a bit confused by the results returned by the functions:
cohen.kappa {concord}
classAgreement {e1071}
when using a two-way table.
for example, if I have an matrix A, and a similar matrix B (same
dimensions), then:
matrix A and B can be found:
http://casoilresource.lawr.ucdavis.edu/drupal/files/a_40.txt
http://casoilresource.lawr.ucdavis.edu/drupal/files/b_40.txt
A <-
2011 Jun 22
1
caret's Kappa for categorical resampling
Hello,
When evaluating different learning methods for a categorization problem with
the (really useful!) caret package, I'm getting confusing results from the
Kappa computation. The data is about 20,000 rows and a few dozen columns,
and the categories are quite asymmetrical, 4.1% in one category and 95.9% in
the other. When I train a ctree model as:
model <- train(dat.dts,
2007 Mar 22
3
Cohen's Kappa
Hi,
im little bit confused about Cohen's Kappa and i should be look into the
Kappa function code. Is the easy formula really wrong?
kappa=agreement-chance/(1-chance)
many thanks
christian
###############################################################################
true-negativ:7445
false-positive:3410
false-negativ:347
true-positiv:772
classification-aggrement:68,6%
2008 Sep 07
1
cohen's kappa
Dear all,
I have a question on Cohen's kappa:
Assume I have two datasets, one has 500 objects, 10 methods and the other,
1000 different objects, 20 different methods. Could I compare between the
two datasets to conclude the 10 methods are more "concordant" than the 20
ones by looking at some output, for example, cohen.kappa{concord} ?
One more, could anyone explain in brief,
2012 Dec 11
0
Comparing Kappa coefficients
I have a simple R script which uses the psych package to calculate cohens
kappa (weighted) from a csv file. The csv file has 2 columns of ordinal data
- one ranked by an experienced observer and the other by a novice who is
undergoing training. What I would like to do is measure kappa for subsets of
this data (say 30-50 ratings) and check whether the observed agreement
between novice and
2002 Feb 05
2
Measures of agreement
Greetings.
I've been experimenting with some algorithms for document classification
(specifically, a Naive Bayes classifier and a kNN classifier) and I would
now like to calculate some inter-rater reliability scores. I have the data
in a PostgreSQL database, such that for each document, each measure (there
are 9) has three variables: ap_(measure), nb_(measure), and
knn_(measure). ap is me