Dear List,
Catching up with my backlog, I stumbled upon this :
On Wed, 11 Feb 2009 10:33:13 +1300, Rolf Turner wrote :
I am appealing to the general collective wisdom of this list in respect
of a statistics (rather than R) question. This question comes to me
from a friend who is a
convinced.
Hope this makes sense,
Michael
-Original Message-
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org]
On Behalf Of Rolf Turner
Sent: Dienstag, 10. Februar 2009 22:33
To: R-help Forum
Subject: [R] OT: A test with dependent samples.
I am appealing
: A test with dependent samples.
I am appealing to the general collective wisdom of this list in
respect
of a statistics (rather than R) question. This question comes to me
from a friend who is a veterinary oncologist. In a study that she is
writing up there were 73 cats who were treated
I am appealing to the general collective wisdom of this
list in respect of a statistics (rather than R) question. This question
comes to me from a friend who is a veterinary oncologist. In a study
that
she is writing up there were 73 cats who were treated with a drug called
piroxicam. None
In the biomedical arena, at least as I learned from Rosner's
introductory text, the usual approach to analyzing paired 2 x 2 tables
is McNemar's test.
?mcnemar.test
mcnemar.test(matrix(c(73,0,61,12),2,2))
McNemar's Chi-squared test with continuity correction
data: matrix(c(73,
73 cats were treated. None barfing before and 12 after.
This gives the table:
| After | Yes | No | Total |
|+-++---|
| Before Yes | 0 | 0 | 0 |
| Before No | 12 | 61 |73 |
|+-++---|
| Total | 12 | 61 |73 |
and a
Of David Winsemius
Sent: Tuesday, February 10, 2009 1:51 PM
To: Rolf Turner
Cc: R-help Forum
Subject: Re: [R] OT: A test with dependent samples.
In the biomedical arena, at least as I learned from Rosner's
introductory text, the usual approach to analyzing paired 2 x 2 tables
is McNemar's test
on 02/10/2009 03:33 PM Rolf Turner wrote:
I am appealing to the general collective wisdom of this
list in respect of a statistics (rather than R) question. This question
comes to me from a friend who is a veterinary oncologist. In a study that
she is writing up there were 73 cats who were
:51 PM
To: Rolf Turner
Cc: R-help Forum
Subject: Re: [R] OT: A test with dependent samples.
In the biomedical arena, at least as I learned from Rosner's
introductory text, the usual approach to analyzing paired 2 x 2 tables
is McNemar's test.
?mcnemar.test
mcnemar.test(matrix(c(73,0,61,12),2,2
Still seems that McNemar's test is the appropriate test for the
matched design, but my first answer sent the input to the function
incorrectly, and it's not clear that a normal theory test would be
accurate in all instances. The matrix should have 61 cats with no
vomiting under either
...@verizon.net [mailto:markle...@verizon.net]
Sent: Tuesday, February 10, 2009 2:54 PM
To: Bert Gunter
Cc: 'David Winsemius'; 'Rolf Turner'; r-help@r-project.org
Subject: Re: [R] OT: A test with dependent samples.
Hi: Bert: can you do that because the null is that they are equal
before and after
, February 10, 2009 2:54 PM
To: Bert Gunter
Cc: 'David Winsemius'; 'Rolf Turner'; r-help@r-project.org
Subject: Re: [R] OT: A test with dependent samples.
Hi: Bert: can you do that because the null is that they are equal
before and after,
not that the proportion is zero ? Thank for any
On 11/02/2009, at 1:06 PM, Bert Gunter wrote:
The only question at issue (i.e. capable of being addressed) is: is
giving
the drug to non-vomiting cats associated with vomiting? (I would
strongly
suspect that cats that were vomiting beforehand would have been
excluded
from the study, as
-help@r-project.org
Sent: Tuesday, February 10, 2009 4:50 PM
Subject: Re: [R] OT: A test with dependent samples.
In the biomedical arena, at least as I learned from Rosner's introductory
text, the usual approach to analyzing paired 2 x 2 tables is McNemar's
test.
?mcnemar.test
mcnemar.test
There are a number of others considerations as well.
Were all the cats given the same dose? If we can establish
that the cats that vomited had a higher dose than the
ones that did not then this would be further evidence. Or if
the cats that vomitted had a lower dose perhaps the drug
is
24th St
Richland, MI, USA 49083
Mail: richs...@earthlink.net
- Original Message - From: David Winsemius dwinsem...@comcast.net
To: Rolf Turner r.tur...@auckland.ac.nz
Cc: R-help Forum r-help@r-project.org
Sent: Tuesday, February 10, 2009 4:50 PM
Subject: Re: [R] OT: A test with dependent
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