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/