Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: How to Graph - Exponential model


From   "Heather Sun, MD" <heather.sun@stanford.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: How to Graph - Exponential model
Date   Mon, 1 Oct 2012 13:02:34 -0700 (PDT)

Yes, I tried:

 twoway (function _b[b1:_cons] * _b[b2:_cons] ^ x, range(x)) (scatter y x)

But it only graphed y-values for half of the x-values and in a very scattered skewed way (not a nice exponential line as expected).  

----- Original Message -----
From: "Richard Goldstein" <richgold@ix.netcom.com>
To: statalist@hsphsun2.harvard.edu
Sent: Monday, October 1, 2012 12:50:57 PM
Subject: Re: st: How to Graph - Exponential model

did you try -twoway function- to get your line?

Rich

On 10/1/12 3:35 PM, Heather Sun, MD wrote:
> Dear All:
> 
> I have performed the non-linear least squares estimation method of regression, using the exponential model y = b1*b2^x.
> 
> I would like to create a graph of this equation on a scatterplot of my data, along with 95% confidence interval lines.  
> 
> I am able to create the scatterplot but am having difficulty graphing the regression exponential equation line.  I have tried twoway graphs, but the fit plot options of linear prediction and quadratic prediction with confidence intervals obviously does not match the exponential model.  
> 
> Thanks in advance!
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index