[Rsiena-help] error including interaction effect

[Bob Faris]

Hello all, I'm relatively new to R and Siena and am analyzing coevolution
data on drinking and friendship, with a focus on how depression moderates
this process. I have been able to include an interaction term between ego's
level of depression (as a time varying covariate) and alter's drinking in
the network function, but when I try to include a parallel interaction
between ego's depression and alters' average drinking (avAlt, which is
included in the effects list) on the behavior function, I get an
error.  I suspect
it's something trivial, but I haven't been able to find a way to get around
it and would be deeply grateful for any assistance.

Here's the code

> myCoEvolutionEff <- includeInteraction(myCoEvolutionEff,
                                        name = "drinkingbeh", effFrom,
avAlt,
                                        interaction1=c("depression",
"drinkingbeh"))

Error in includeInteraction(myCoEvolutionEff, name = "drinkingbeh",
effFrom,  :
  Second effect not found


Thanks in advance,
Bob​ Faris

************************************
Robert Faris, PhD
Associate Professor
Department of Sociology
University of California at Davis
2247 Social Sciences and Humanities
One Shields Avenue
Davis, CA 95616
Cell:  510-221-8876
Fax 530-752-0783
http://sociology.ucdavis.edu/people/rwfaris
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.r-forge.r-project.org/pipermail/rsiena-help/attachments/20160103/c53fc11e/attachment.html>