Bookmark and Share

Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.


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

RE: st: types and codes of the non-linear models


From   "BASSILI, Dr Amal STB/TDR" <[email protected]>
To   "[email protected]" <[email protected]>
Subject   RE: st: types and codes of the non-linear models
Date   Thu, 21 Feb 2013 13:59:54 +0000

Hi Maarten,

I have done the below non-linear regression to predict incidence of a disease over years and would like to know how to interpret the trend. If b2 =0.87, does this mean that the average trend is 0.87% per year?


-----------------------------
nl exp2 : incidence_rate year
(obs = 7)

Iteration 0:  residual SS =  66.15485
Iteration 1:  residual SS =  66.15484

      Source |       SS       df       MS
-------------+------------------------------         Number of obs =         7
       Model |  387.559441     0           .         R-squared     =    0.8542
    Residual |  66.1548444     6  11.0258074         Adj R-squared =    0.8542
-------------+------------------------------         Root MSE      =  3.320513
       Total |  453.714286     6  75.6190476         Res. dev.     =  35.58776

2-parameter exp. growth curve, incidence_rate = b1*b2^year
------------------------------------------------------------------------------
incidence_~e |      Coef.   Std. Err.      t    P>|t|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
         /b1 |   3.9e+116          .        .       .            .           .
         /b2 |   .8763577   .0000164 53453.24   0.000     .8763176    .8763978
------------------------------------------------------------------------------
  Parameter b1 taken as constant term in model & ANOVA table

Thanks, 

Amal

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Maarten Buis
Sent: Thursday, February 21, 2013 10:36 AM
To: [email protected]
Subject: Re: st: types and codes of the non-linear models

On Wed, Feb 20, 2013 at 8:28 PM, BASSILI, Dr Amal     STB/TDR wrote:
> Please let me know the types and STATA codes of the non-linear models that can forecast the incidence rate of a disease if linear regression cannot be used.

The number of options open to you is just too large to list here. We could write a book-length post here with lots of options and code.
However, this would require a lot of work from us (for free), and most of it would be useless to you as it would not apply to your problem.
In order to get a more useful response you need to narrow your question down by giving us more details on what you want to do.

-- Maarten

---------------------------------
Maarten L. Buis
WZB
Reichpietschufer 50
10785 Berlin
Germany

http://www.maartenbuis.nl
---------------------------------
*
*   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 1996–2018 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   Site index