turn on suggestions

Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.

Showing results for

Find a Community

- Home
- /
- SAS Programming
- /
- General Programming
- /
- poisson and negative binomial distribution

Topic Options

- RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page

- Mark as New
- Bookmark
- Subscribe
- RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

03-29-2018 06:08 PM

Hello,

I need to perform a Negative Binomial and Poisson distribution for a data that I have. Using GENMOD, COUNTREG and specifying distribution as NB or Poisson, I got the mean as a linear function of x Variables. However, I have my own defined Non linear function such as Hoerl and Sigmoidal function that I need to incorporate in the distribution.

For example, instead of this form.

The function I need to use is below moreover the bottom 2. Where miu can is in terms of E.

Any help would be greatly appreciated.

- Mark as New
- Bookmark
- Subscribe
- RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

Posted in reply to Unay13

03-29-2018 06:40 PM

Your equations don't show up. Anyway, you should consider using **proc nlmixed**.

PG

- Mark as New
- Bookmark
- Subscribe
- RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

Posted in reply to PGStats

03-29-2018 07:55 PM

The equations are the Sigmoidal and Hoerl Function. As I am new to SAS I did not exactly understand how proc nlmixed works. Could you please help me with that?

- Mark as New
- Bookmark
- Subscribe
- RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

Posted in reply to Unay13

03-29-2018 11:33 PM

I'm not a real user of proc nlmixed , I just went with its description. The negbin distribution is often difficult to fit with proc countreg or proc glimmix, so I would expect at least the same level of difficulty with proc nlmixed. You might ask for help about nlmixed on the SAS Statistical Procedures Community to find some expertise. Best of luck.

PG