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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 14:40:18 +0100

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

> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Cheng,
> Xiaoqiang
> Sent: 02 October 2006 14:39
> To: statalist@hsphsun2.harvard.edu
> Subject: st: RE: RE: RE: RE: RE: st: ´ð¸´: st: How to choose a proper
> model if the dependent variable is within bounds?
> 
> 
> Thank you very much.
> 
> 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?
> 
> Xiaoqiang Cheng
> 
> University of Leuven
> Tel  +32 16 326853
> Fax  +32 16 326796
> Mail  Xiaoqiang Cheng
>       Center for Economic Studies
>       University of Leuven
>       Naamsestraat 69
>       Leuven,  Belgium
>       B3000
> Url www.econ.kuleuven.be/xiaoqiang.cheng
> 
> 
> 
> 
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu 
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Maarten Buis
Sent: 2006年10月2日 15:05
To: statalist@hsphsun2.harvard.edu
Subject: st: RE: RE: RE: RE: st: ´ð¸´: st: How to choose a proper model if the dependent variable is within bounds?

Xiaoqiang Cheng
These questions are answered by the helpfileof -mfx-: 
-mfx- will also work for -probit-, -logit- and 
-tobit-. In case of -probit-, and -logit- I actually 
prefer -prchange-, which is part of the -spost- 
package (see -findit spost-). For -tobit- there also 
exist the -dtobit- user written command (see: 
-findit dtobit-). You can specify the values of x at which 
you want to calculate the marginal effect  with the at() 
option, see -help mfx-.
HTH,
Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology 
Vrije Universiteit Amsterdam 
Boelelaan 1081 
1081 HV Amsterdam 
The Netherlands

visiting adress:
Buitenveldertselaan 3 (Metropolitan), room Z434 

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Cheng, Xiaoqiang
Sent: maandag 2 oktober 2006 14:46
To: statalist@hsphsun2.harvard.edu
Subject: st: RE: RE: RE: st: ´ð¸´: st: How to choose a proper model if the dependent variable is within bounds?
how to specify a certain value of x if I want to predict the dy/dx using -mfx- for the certain value of x? And is there any similar postestimation command like -mfx- for -probit-, -logit- and -tobit-?

 

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