Regarding significance tests for 2x2 tables.
I do not know what to make of all the debating this
way and that way in the literature.
Q: Under what circumstance does one use the "exact test"
conditional on the "marginals being what they are" ?
I have seen the distinction made (supposedly
In article [EMAIL PROTECTED] (Donald Burrill) wrote:
Sounds like a prediction or calibration kind of problem. As Joe Ward
pointed out, raw regression coefficients, and standard errors of
measurement, are more stable than correlation coefficients.
Yes, that's right. Regression will be
Johannes Hartig wrote:
I see that the convenient way of collecting data via internet may lead to badly
designed surveys, and I have seen many of them. But I disagree that collecting
data online is "easy" or "bad" per se, and IMHO online samples are more
heterogenous than student samples and
At 07:32 AM 7/13/00 -0400, Paige Miller wrote:
How exactly do you generalize the results from a "sample" of people who
elect to respond to an opinion question, for example at http://cnn.com,
to a larger population?
this is precisely the problem ... since, there is essentially NO control
over
I wrote:
Internet users are not a random sample of any other population.
Internet users who browse to a given site are not a random sample of
internet users. And internet users who bother to fill out a form are not
a random sample of anything. Your student will have data
I don't think there is an agreement in the statistical community. In the
clinical trials circles conditional tests are highly regarded and the
most convincing evidence I have seen so far is Yates (1984, J. of Royal
Stat Soc, A147:426-463).
Mithat
In article 8kjlju$ni8$[EMAIL PROTECTED],
Ron
While I agree that online surveys are of dubious value, some of the
opposition sounds too moralistic or contentious for my taste. Here is
a parable.
The usual formulae of inferential statistics estimate the error made
by using a random sample instead of a census. If you did not take a
random
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Bob Hayden wrote:
While I agree that online surveys are of dubious value, some of the
opposition sounds too moralistic or contentious for my taste. Here is
a parable.
(excellent example of the spherical Statue of Liberty omitted)
So I don't mind if you use an online sample, but
- Forwarded message from George W. Cobb -
I don't disagree at all with Bob's point (there goes another chance to
be contentious!) but you can sometimes go a long way using the right
simplifying assumptions. Here's the reference:
O'Conner, M.P., and J.R. Spotilla (1992). "Consider a
On 13 Jul 2000 08:56:24 -0700, [EMAIL PROTECTED] (Bob Hayden)
wrote:
While I agree that online surveys are of dubious value, some of the
opposition sounds too moralistic or contentious for my taste. ...
snip, rest
I was thinking "too contentious", too, until I noticed that the
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