[statnet_help] Intercept for ordinal data in REM

[Carter T. Butts via statnet_help]

Hi, Choi -

In the ordinal-time case (where we know the order of events, but not the 
time at which they occurred), the hazards can only be identified up to a 
pacing constant; thus, one does not have an intercept (because the model 
is telling you about relative hazards).  When time is exactly specified 
(up to an arbitrary translation, of course), we do need to specify the 
base rate, so an intercept is called for.

(It has become fashionable in some circles to try to get rid of this yet 
again by using Cox-like constructions that treat the baseline hazard as 
some wild, nonparametric thing that lies outside the model.  Except when 
substantively well-motivated (in which case I have no objection), I tend 
to find this naughty and/or unwise.  But that is a matter for another 
day and another forum, and I will say no more on it here.  Those wishing 
to engage on the matter can do so at the next Sunbelt hospitality suite.)

Hope that helps,

-Carter

On 8/27/24 9:41 PM, SJ C via statnet_help wrote:

> Dear all,

>

> I have a question about including the intercept in REM.

>

> I've noticed that with 'ordinal' data, the intercept is not included 

> in the model, whereas with 'time-stamp' data, it is included. Is my 

> understanding correct?

> (By intercept here I mean creating a variable with a value of one for 

> all nodes and including it as a covariate of CovSnd.)

>

> I'd be grateful if anyone could respond to this question.

> Thank you!

>

> Best,

> Choi

>

>

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