### Algebraic notation for variance in negative binomial model

Posted:

**Fri Oct 05, 2018 11:37 am**Dear Colleagues,

I'm using version 3.02 to run a two level negative binomial model. There seems to be a difference between the algebraic notation for the level 1 variance displayed in the equations window and the notation in teaching materials referencing earlier versions of mlwin and more generally in the literature.

In 3.02 I see..... pi + pi^2*a

Elsewhere I see.... pi + pi^2/v

Is this a bug or is there another explanation?

Many thanks,

Liam

I'm using version 3.02 to run a two level negative binomial model. There seems to be a difference between the algebraic notation for the level 1 variance displayed in the equations window and the notation in teaching materials referencing earlier versions of mlwin and more generally in the literature.

In 3.02 I see..... pi + pi^2*a

Elsewhere I see.... pi + pi^2/v

Is this a bug or is there another explanation?

Many thanks,

Liam