About the NLMIXED procedures of the growth models (e.g., Logistic and Gompertz functions)

[Alexo2025]

Dear all,

I have a data set like this in Excel format;

ID	Country	Age	Weight	Sex	Area
ET010001	Ethiopia	1	8.5	Female	Urban
ET010001	Ethiopia	5	15.6	Female	Urban
ET010001	Ethiopia	8	20.1	Female	Urban
ET010002	Ethiopia	1	7.5	Male	Rural
ET010002	Ethiopia	5	13.2	Male	Rural
ET010002	Ethiopia	8	17.6	Male	Rural
ET010004	Ethiopia	1	9.5	Female	Urban
ET010004	Ethiopia	5	16.6	Female	Urban
ET010004	Ethiopia	8	20.6	Female	Urban
IN010001	India	1	7.6	Male	Urban
IN010001	India	5	16.7	Male	Urban
IN010001	India	8	22.3	Male	Urban
IN010002	India	1	8.3	Male	Rural
IN010002	India	5	15.0	Male	Rural
IN010002	India	8	21.5	Male	Rural
IN010003	India	1	7.2	Female	Urban
IN010003	India	5	14.0	Female	Urban
IN010003	India	8	18.3	Female	Urban
.	.	.	.	.	.
.	.	.	.	.	.
.	.	.	.	.	.
IN200105	India	1	9.5	Male	Urban
IN200105	India	5	17.7	Male	Urban
IN200105	India	8	20.2	Male	Urban

How can I estimate the growth models' parameters (by Nlmixed procedure) (e.g., Logistic and Gompertz functions) for each ID as x=Age & y=Weight? And how can I add the three covariates (Country, Sex, & Area)?

Thank You!  

[sbxkoenk]

Hello,

Go to 

https://www.lexjansen.com/

and search for :

- growth model nlmixed gompertz

- growth model nlmixed logistic
... or simply
- growth model nlmixed

Plenty of examples there!

SAS Tip: Learn lexjansen.com
https://communities.sas.com/t5/SAS-Tips-from-the-Community/SAS-Tip-Learn-lexjansen-com/m-p/436336#M2...

Koen

[Rick_SAS · Accepted solution]

If we are going to suggest searching certain sites, another option is to learn the SITE: option for internet search engines. For example, search for 

  growth model nlmixed gompertz site:lexjansen.com

I also suggest searching SAS blogs. For example,

  growth model nlmixed logistic site:blogs.sas.com

reveals the following article that has SAS code and an explanation:

"Fit a growth curve in SAS" : https://blogs.sas.com/content/iml/2018/10/10/fit-growth-curve-sas.html

[Alexo2025]

Yes, your comment is very important to solve the problem.

Great thanks!

[Alexo2025]

Yes, your comment is crucial to resolving the issue.
Thank you very much!