topic Re: About the NLMIXED procedures of the growth models (e.g., Logistic and Gompertz functions) in SAS Software for Learning Community

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

Alexo2025 — Thu, 25 May 2023 15:36:22 GMT

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!

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

sbxkoenk — Sat, 27 May 2023 09:58:10 GMT

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#M26

Koen

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

Rick_SAS — Sat, 27 May 2023 10:19:20 GMT

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

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

Alexo2025 — Tue, 30 May 2023 01:40:03 GMT

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

Great thanks!

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

Alexo2025 — Tue, 30 May 2023 01:47:32 GMT

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