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Dear Ian and others,

To use this option in RSiena where the rate parameter of the actor variable
is set to something approximating minus infinity (-100 will do), it will be
helpful to use a non-centered dummy variable (1 for M, 0 for F).
For this kind of variable (pregnancy), where a duration / event history
model would be appropriate, the model developed in
Greenan, Charlotte C., (2015). Diffusion of Innovations in Dynamic
Networks. *Journal of the Royal Statistical Society, Series A*, 178,
might be a good idea.
See also section 12.2.4 in the RSiena manual
This assumes variables that only can go up (diffustion of innovation), but
it could also be applied to other variables for which duration modeling is
meaningful. Then, however, also the current state (pregnant / non-pregnant)
should be used as a predictor for the rate function.


Tom A.B. Snijders
Professor of Statistics and Methodology, Dept of Sociology, University of
Emeritus Fellow, Nuffield College, University of Oxford

On Sun, Jan 29, 2017 at 10:55 PM, Per Block <[log in to unmask]> wrote:

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> Sender:       Social Networks Discussion Forum <[log in to unmask]>
> Poster:       Per Block <[log in to unmask]>
> Subject:      Re: Actor-Oriented Model Question
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