Hi
On 2 Nov 2001, Donald Burrill wrote:
On Fri, 2 Nov 2001, jim clark wrote:
I would hate to ressurect a debate from sometime in the past
year, but the chi-squared is a non-directional (commonly referred
to as two-tailed) test, although it is true that you only
consider one end (tail)
[EMAIL PROTECTED] (dennis roberts) wrote
most software will compute p values (say for a typical two sample t test of
means) by taking the obtained t test statistic ... making it both + and -
... finding the two end tail areas in the relevant t distribution ... and
report that as p
for
Dennis wrote: it is NOT correct to say that the p value (as
traditionally calculated) represents the probability of finding a result
LIKE WE FOUND ... if the null were true? that p would be ½ of what is
calculated.
Jones and Tukey (A sensible formulation of the significance
At 05:06 PM 11/2/01 -0500, Wuensch, Karl L wrote:
Dennis wrote: it is NOT correct to say that the p value (as
traditionally calculated) represents the probability of finding a result
LIKE WE FOUND ... if the null were true? that p would be ½ of what is
calculated.
Jones
Dennis Roberts [EMAIL PROTECTED] wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
let's say that you do a simple (well executed) 2 group study ...
treatment/control ... and, are interested in the mean difference ... and
find that a simple t test shows a p value (with mean in
In article IOet7.11245$[EMAIL PROTECTED],
Magenta [EMAIL PROTECTED] wrote:
Dennis Roberts [EMAIL PROTECTED] wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
let's say that you do a simple (well executed) 2 group study ...
treatment/control ... and, are interested in the mean
In article [EMAIL PROTECTED],
Dennis Roberts [EMAIL PROTECTED] wrote:
let's say that you do a simple (well executed) 2 group study ...
treatment/control ... and, are interested in the mean difference ... and
find that a simple t test shows a p value (with mean in favor of treatment)
of .009
My opinion, FWIW:
The answer to your question in a strict fashion, assuming the experiment is
well designed, depends to a large extent on your a priori null hypothesis
and how you performed the statistical test.
In this case, presuming that you used a two-sided p value and that you
established
Thanks for your response. All of you are really helpful.
Erik
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if you are talking about a t test for means ... most software would
automatically give a two tailed p value ... unless you specify otherwise
(which software usually will let you do)
here is the typical example
Two-sample T for C1 vs C2
N Mean StDev SE Mean
C1 10 25.70
I've taken the liberty of copying this to the edstat list, and therefore
have quoted the original posting in full, despite having (at the moment)
a comment on only one part of it. -- DFB.
On Tue, 29 Aug 2000, Paul Dudgeon wrote:
Somewhat tangential to the discussion last week about p
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