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Re: st: Estimating Logit Price Response Function With Unknown Market Size


From   Nick Cox <[email protected]>
To   "[email protected]" <[email protected]>
Subject   Re: st: Estimating Logit Price Response Function With Unknown Market Size
Date   Wed, 27 Nov 2013 19:12:28 +0000

You asked the same question on 22 November.

When there is no response, often a question is perceived as not being
clear enough to answer.

I read this as fitting a logistic growth curve to time series. The
upper asymptote is unknown and thus a parameter to be estimated. This
is a classic for -nl-: indeed a sample program -log3- for precisely
this model is bundled with Stata. Have look at the manual entry for
-nl-.

Nick
[email protected]


On 27 November 2013 15:47, Marigliano, Joseph
<[email protected]> wrote:

> I have a file containing historical sales data
> by product.
> It contains product and cumulative sales by price point for the last 6
> months.
> I am looking to estimate the curve as a logit, but do not know the
> market size.
> Are there any good examples of this?
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