Em 9/9/2011 14:32, array chip escreveu:
Thanks all again for the suggestions. I agree with Wolfgang that
mcnemar.test() is what I am looking for. The accuracy is the
proportion of correct diagnosis compared to a gold standard, and I am
interested in which diagnosis test is better, not particular
, 2011 1:24 AM
Subject: RE: [R] suggestion for proportions
I assume you mean Cohen's kappa. This is not what the OP is asking about. The
OP wants to know how to test for a difference in the proportions of 1's.
Cohen's kappa will tell you what the level of agreement is between the two
tests
Of csrabak
Sent: Thursday, September 08, 2011 02:31
To: array chip
Cc: r-help@r-project.org
Subject: Re: [R] suggestion for proportions
Em 7/9/2011 16:53, array chip escreveu:
Hi all, thanks very much for sharing your thoughts. and sorry for my
describing the problem not clearly, my fault.
My
Em 8/9/2011 05:24, Viechtbauer Wolfgang (STAT) escreveu:
I assume you mean Cohen's kappa. This is not what the OP is asking
about. The OP wants to know how to test for a difference in the
proportions of 1's. Cohen's kappa will tell you what the level of
agreement is between the two tests. This
Hi, I am wondering if anyone can suggest how to test the equality of 2
proportions. The caveat here is that the 2 proportions were calculated from the
same number of samples using 2 different tests. So essentially we are comparing
2 accuracy rates from same, say 100, samples. I think this is
From you description, you should not used a paired Student's t-test. One uses
a paired test when pairs of observations come from the same experimental unit
(and thus are correlated). You describe a study where each experimental unit
is tested once and where there are two independent groups of
Please! ... ?prop.test
not t tests.
-- Bert
--
On Wed, Sep 7, 2011 at 4:21 AM, John Sorkin jsor...@grecc.umaryland.edu wrote:
From you description, you should not used a paired Student's t-test. One
uses a paired test when pairs of observations come from the same
experimental unit (and
: [R] suggestion for proportions
Please! ... ?prop.test
not t tests.
-- Bert
--
On Wed, Sep 7, 2011 at 4:21 AM, John Sorkin jsor...@grecc.umaryland.edu
wrote:
From you description, you should not used a paired Student's t-test.
One uses a paired test when pairs of observations come
-boun...@r-project.org [mailto:r-help-boun...@r-project.org]
On Behalf Of Bert Gunter
Sent: Wednesday, September 07, 2011 15:34
To: John Sorkin
Cc: r-help@r-project.org
Subject: Re: [R] suggestion for proportions
Please! ... ?prop.test
not t tests.
-- Bert
--
On Wed, Sep 7, 2011 at 4
] suggestion for proportions
Please! ... ?prop.test
not t tests.
-- Bert
--
On Wed, Sep 7, 2011 at 4:21 AM, John Sorkin jsor...@grecc.umaryland.edu
wrote:
From you description, you should not used a paired Student's t-test.
One uses a paired test when pairs of observations come from
, 2011 16:47
To: Viechtbauer Wolfgang (STAT)
Cc: r-help@r-project.org; John Sorkin
Subject: Re: [R] suggestion for proportions
Wolfgang:
On Wed, Sep 7, 2011 at 7:28 AM, Viechtbauer Wolfgang (STAT)
wolfgang.viechtba...@maastrichtuniversity.nl wrote:
Acutally,
?mcnemar.test
since
: Wednesday, September 07, 2011 16:47
To: Viechtbauer Wolfgang (STAT)
Cc: r-help@r-project.org; John Sorkin
Subject: Re: [R] suggestion for proportions
Wolfgang:
On Wed, Sep 7, 2011 at 7:28 AM, Viechtbauer Wolfgang (STAT)
wolfgang.viechtba...@maastrichtuniversity.nl wrote:
Acutally
Em 7/9/2011 16:53, array chip escreveu:
Hi all, thanks very much for sharing your thoughts. and sorry for my describing
the problem not clearly, my fault.
My data is paired, that is 2 different diagnostic tests were performed on the same
individuals. Each individual will have a test results
Would the following strategy work?
numtests - 20
# Create a data frame: test1 results from trial 1
# test2 results from trial 2
# agree indicagtor if trial1= trial2 (value =1) or
# trial1trial2 (value =0)
data -
Let my try again, but this time with corrected R code:
would the following strategy work:
numtests - 2000
# Create a data frame: test1 results from trial 1
# test2 results from trial 2
# agree indicagtor if trial1= trial2 (value =1) or
#
Correction. It won't work. Please ignore.
John Sorkin 9/7/2011 10:41:46 PM
Let my try again, but this time with corrected R code:
would the following strategy work:
numtests - 2000
# Create a data frame: test1 results from trial 1
# test2 results from trial 2
#
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