Re: Binomial dta: how to handle don't-cares?

On Thu, 8 Feb 2007 07:08:48 -0500, Stan Brown
<the_stan_brown@xxxxxxxxxxx> wrote:

[snip, various]

I agree with you that of course the full numbers should be prevented;
my question was about proper drawing of conclusions.

It seems obvious that opinion is quite strongly "no", but I'm looking
at how to frame a proper hypothesis test and p-value.

"Even when you lump the Yes with (the relatively small number that
are) Neutral, there is a clear majority for No." That would seem to
cover it.

The binomial CI is then appropriate.

But the informal conditions of the survey suggest that the
statistical test is not thoroughly robust. It could be interesting,
say, if the "early returns" could be compared to "late returns"
or if several sources could be compared. Ordinary political
surveys gain credibility by citing previous surveys, and citing
other surveys.



Alternatively, maybe I should make it a 95% confidence interval. Do I
calculate a binomial CI from a sample size of 380-29, excluding the
neutrals as though they had not responded? Or does the three-way
nature of the question mean that I can't analyze it in a binomial
manner and have to do some sort of Chi-squared?

--
Rich Ulrich, wpilib@xxxxxxxx
http://www.pitt.edu/~wpilib/index.html
.

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