David Radwin <[email protected]>:
I think it's fairly easy to prove via counterexample or simulation
that this can easily give the wrong answer. Can you give a reference
that supports it?
On 9/18/07, David Radwin <[email protected]> wrote:
> [This email did not appear to go through the first time, and I
> apologize if this is the second time you are seeing it.]
>
> Hugh,
>
> Another possibility is to approximate a continuous measure of income
> by using the midpoint of the range as the actual value. So, for
> example, the first value would be $12,500, the second would be
> $75,000, etc.
> Then you can calculate and report estimated group means for A and B
> and the difference between them, and you can also do the usual
> difference-of-means hypothesis testing.
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