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Re: st: reshaping data?
From
Yuval Arbel <[email protected]>
To
[email protected]
Subject
Re: st: reshaping data?
Date
Thu, 25 Oct 2012 16:24:52 +0200
Here is a link to an excellent book in consumer's behavior theory:
http://www.amazon.com/Economics-Consumer-Behavior-Angus-Deaton/dp/0521296765
On Thu, Oct 25, 2012 at 4:19 PM, Yuval Arbel <[email protected]> wrote:
> Before going any further, please note that the model you proposed is
> incorrectly specified. Any decent Econometric textbook will
> demonstrate the endogeneity between P1 and Q1. Moreover, if you would
> like to estimate the demand for each product - you need to have some
> measure to the level of income of each consumer
>
> On Thu, Oct 25, 2012 at 4:08 PM, <[email protected]> wrote:
>> Dear all,
>> I would be grateful if you could help me to address the following problem:
>> I have to estimate the equation
>>
>> Q1=a+b1P1+b2P2+…bnPn+e
>>
>> Where Q1 is the quantity of item 1 sold by a supermarket during a week , P1
>> is the price of item 1 in that week, the other prices are those of the n
>> items belonging to the same family of items. My data set is organized as
>> follows:
>>
>>
>> Code_item week Q P Code_family
>> 789 1 8 2 1
>> 790 1 25 4 1
>> 791 1 9 1.3 1
>>
>> 792 1 12 2 1
>>
>> 800 1 7 2 2
>> 801 1 20 1.2 2
>> 802 1 11 1.6 2
>>
>> 803 1 12 2 2
>>
>> And so forth for the other weeks and families…
>>
>> For each item, how can I include in my regression the prices of the other
>> (n-1) items of the same family, ignoring the prices of the items belonging
>> to other families?
>> Thank you in advance
>> Maria
>>
>>
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>>
>>
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>
>
>
> --
> Dr. Yuval Arbel
> School of Business
> Carmel Academic Center
> 4 Shaar Palmer Street,
> Haifa 33031, Israel
> e-mail1: [email protected]
> e-mail2: [email protected]
--
Dr. Yuval Arbel
School of Business
Carmel Academic Center
4 Shaar Palmer Street,
Haifa 33031, Israel
e-mail1: [email protected]
e-mail2: [email protected]
*
* For searches and help try:
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* http://www.stata.com/support/faqs/resources/statalist-faq/
* http://www.ats.ucla.edu/stat/stata/