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st: Re: thank you for your kindly help, I still feel confused about my dataset


From   Christopher Baum <kit.baum@bc.edu>
To   zhiqiang zhang <nkzzq@yahoo.com.cn>
Subject   st: Re: thank you for your kindly help, I still feel confused about my dataset
Date   Tue, 7 Dec 2010 09:12:15 -0500

I don't understand the notation in your equation. What is the summation over, and what variables in the summation are thus subscripted? Is \sum(Yr) just a number for each observation, or are there a number of different terms, with e.g. Distance also varying within the summation? It is not clear just what equation you are trying to estimate.

Kit

On Dec 7, 2010, at 1:59 AM, zhiqiang zhang wrote:

> Dear Professor :
>    Thank you for your kindly help. I follow your advice and change the dataset. 
> But I still feel confused about my nl methods for my wage equation. I append the 
> final dataset in my email. 
> 
> nl  (lnwage = {b0}*lnincome*exp({b1}*distance)) , Does this nl function can 
> estimate the wage equation that I wanted?
> log( Wager)= K1*log[(∑Yr* exp-(K2*Distance) )+U.
> The variable in my dataset meaning are as follows:
> Lnwage  is the left side variable , lnincome is the right hand Y variable, and 
> distance is also include in the dataset. 
> 
> I stacked the Y variables as well as the distance variable. Does this mean that 
> the nl  (lnwage = {b0}*lnincome*exp({b1}*distance))  command can estimate my 
> target equation? I don't want to estimate each k2 for individual province in my 
> equation. 
> 
> By the way, thank you for your kindly help. I sincerely  hope that you can help 
> me with my confusion. 
> 
> 
> 
> Best Regards
> ZhiqiangzhangNankai university China
> Best Regards 
> 
> 
> Zhiqiang Zhang
> Nankai University
> nkzzq@yahoo.com.cn
> zhiqiangzhangnk@gmail.com
> 
> 
> 
> <dataset.dta>




Kit Baum   |   Boston College Economics & DIW Berlin   |   http://ideas.repec.org/e/pba1.html
                              An Introduction to Stata Programming  |   http://www.stata-press.com/books/isp.html
   An Introduction to Modern Econometrics Using Stata  |   http://www.stata-press.com/books/imeus.html


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