[ACT-R-users] How do I archive probabilistic production rule selection?

[db30 at andrew.cmu.edu]

--On Tuesday, August 29, 2017 11:51 PM -0400 Kai Sauerwald 
<kai.sauerwald at fernuni-hagen.de> wrote:

> Hello,
>
> is there a way to archive probabilistic selection of production rules in
> ACT-R?
>
> More concrete:  suppose two productions p1 and p2 with the same condition,
> how do I have to setup the rules and ACT-R such that p1 is selected with
> probability 0.3 and p2 selected with probability 0.7 in conflict resolution?
>
>

To do that you would need to set the utilities of those productions and the
utility noise value.  The equation that describes the probability of choosing
a production based on its utility, the utility of the competing productions,
and the utility noise is shown in unit 6 of the ACT-R tutorial.  Unit 3 of
the tutorial shows how to set fixed utility values using the spp command, and
the parameter for utility noise is :egs as shown in unit 6.  Unit 6 also
describes the process through which a model can learn those utility values
based on the rewards it is given.

Hope that helps,
Dan