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
- /
- Analytics
- /
- Stat Procs
- /
- WARNING: Obtaining minimum variance quadratic unbi...

Topic Options

- Subscribe to 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
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

05-14-2017 06:27 AM - edited 05-14-2017 06:29 AM

Hi all,

I am trying to do logistic regression with random effiect for binary data by GLIMMIX.

However, I get warinig message as follows;

WARNING: Obtaining minimum variance quadratic unbiased estimates as starting values for the covariance parameters failed

Anyone know how I can overcome this problem?

Thanks,

--------------------------------------------------------------------------------

proc glimmix data=logitbank method=quad;

class fid;

model ydat2(event='1') = D1013 fid*D1013

/dist = binary link=logit ddfm=none solution;

random intercept/ subject=fid;

output out =glmout pred =xbeta pred(ilink) =predprob;

covtest;

run;

---------------------------------------------------------------------------------

Accepted Solutions

Solution

05-20-2017
07:05 AM

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

Posted in reply to Tissue5454

05-15-2017 09:06 AM

All Replies

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

Posted in reply to Tissue5454

05-14-2017 07:13 AM

Why you include subject term in the independent variables ?

Try option type=chol.

random intercept/ subject=fid type=chol ;

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

Posted in reply to Ksharp

05-14-2017 07:50 AM

Hi Ksharp!

Thank you for reply!

>Why you include subject term in the independent variables ?

Because I want to include not only random intercept but also random slope.

>Try option type=chol.

I received same warning message: WARNING: Obtaining minimum variance quadratic unbiased estimates as starting values for the covariance parameters failed...

Tissue5454

Solution

05-20-2017
07:05 AM

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

Posted in reply to Tissue5454

05-15-2017 09:06 AM

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

Posted in reply to Ksharp

05-16-2017 08:37 PM

Hi Ksharp!

Thank you for reply!

I tried PARAM statement and succeed in getting result!

I think the warning message;

"WARNING: Obtaining minimum variance quadratic unbiased estimates as starting values for the covariance parameters failed" tend to come up when the model is too complicated.

In my case, independent variable "D1013" is nonsignificant .

Thank you again,

tissue5454

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

Posted in reply to Tissue5454

05-17-2017 08:12 AM

I am glad that worked and pround of your effort .