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st: =?utf-8?B?UkU6IFJFOiBSRTogUkU6IFJFOiBSRTogc3Q6IMK0w7DCuMK0?==?utf-8?B?OiBzdDogSG93IHRvIGNob29zZSBhIHByb3BlciBtb2Q=?==?utf-8?B?ZWwgaWYgdGhlIGRlcGVuZGVudCB2YXJpYWJsZSBpcyA=?==?utf-8?B?d2l0aGluIGJvdW5kcz8=?=


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: =?utf-8?B?UkU6IFJFOiBSRTogUkU6IFJFOiBSRTogc3Q6IMK0w7DCuMK0?==?utf-8?B?OiBzdDogSG93IHRvIGNob29zZSBhIHByb3BlciBtb2Q=?==?utf-8?B?ZWwgaWYgdGhlIGRlcGVuZGVudCB2YXJpYWJsZSBpcyA=?==?utf-8?B?d2l0aGluIGJvdW5kcz8=?=
Date   Mon, 2 Oct 2006 14:44:16 +0100

Stata does not know anything about your variables
that you have not told it. Thus, if you use certain 
units in your dataset, but wish to change to other 
units, the translation is your responsibility. 

I don't know if this answers the question, which 
doesn't seem at all clear to me: for example, what 
is reality, independent of choice of units? 

Nick 
n.j.cox@durham.ac.uk 

Cheng, Xiaoqiang
 
> Can we think an alternative of your previous suggestion about 
> the prediction of dy/dx when it exceeds unit? 
> 
> One example will be: if the prediction exceeds unit and x is 
> counted in 100s (one unit of x in sample data means 100 in 
> reality. For instance, x stands for kilometres. In reality, 
> the distance from Brussels to Leuven is 20 km, but in our 
> sample we count the distance as 0.2), can we interpret the 
> dy/dx by, lets say, one unit of x increase in reality, the y 
> will increase (dy/dx)/100?

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