Re: Binomial dta: how to handle don't-cares?
- From: Richard Ulrich <Rich.Ulrich@xxxxxxxxxxx>
- Date: Tue, 06 Feb 2007 23:41:48 -0500
On Mon, 5 Feb 2007 16:52:33 -0500, Stan Brown
<the_stan_brown@xxxxxxxxxxx> wrote:
Greetings. I'm embarrassed to ask this, but I'm more embarrassed at
not knowing the answer:
Survey taken: 1366 mailed out
Responses received: 380
119 "yes"
29 neutral
232 "no"
In case you're wondering, it was about a proposed sewer system in my
town, where people currently have septic and density is low. The
estimated cost is about $150 a month per household in taxes, plus
monthly sewer fees, plus $3-5K to connect. No wonder the people are
opposed, and no wonder the response rate was so high.
On a null hypothesis of "opinion is evenly divided" I get a tiny p-
value no matter whether I count "yes" as 119 out of 380 or 119 out of
380-29 = 351. But I wonder what is the right thing to do. In yes/no
surveys, when you have don't-care responses, how are they best
treated?
Okay, there is a preference for No, regardless of what
you do with "neutral." The presentation is more a matter
of politics and of sense, than of statistics.
Who has been campaigning how strongly, for what?
- Is this a 'random' sample, or was there any chance that
one side is using the survey as a tool?
Was this question the whole content of the survey?
Definitely, state the full results - all three categories.
The ethics of survey-reporting says that you must be explicit
about the context, the content, the questions, etc.
--
Rich Ulrich, wpilib@xxxxxxxx
http://www.pitt.edu/~wpilib/index.html
.
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