VI VI

CSGnet Archive CSG1994
1

(From Sam(uel) Saunders [941028:2030 EDT])

I have been trying some variations on the changeover in Bill Powers' varint
simulation. I tried making the fixed delay inversely proportional to the
schedule interval, but did not come up with any set of parameters that looked
promising. A variant I tried that was more sucessful was to increase the fixed
delay after reinforcement. I got the sort of mild undermatching I would
hope to see. I need to experiment more to see how satisfactory this variant
may be.

In Conc VI VI, the propability of reinforcement remains constant for the
schedule in which the bird is responding, but is increasing in the other
schedule. At some point, no matter how lean the other schedule, the
probability
of reinforcement will be higher, and the bird should change over. When the
bird is responding in the leaner schedule, probability in the alternative will
quickly become higher, and this may be behind the need for a COD. I think this
may need to be included in the simulation, but I am not sure yet how to do it.

Sam
Samuel Spence Saunders, Ph.D.
sssaunders@delphi.com

···

--
Samuel Spence Saunders, Ph.D.
aa754@freent.buffalo.edu

2

[From Bill Powers (941029.0905 MDT)]

Sam Saunders [941028:2030 EDT] --

In Conc VI VI, the probability of reinforcement remains constant for
the schedule in which the bird is responding, but is increasing in the
other schedule. At some point, no matter how lean the other schedule,
the probability of reinforcement will be higher, and the bird should
change over.

How is the bird detecting the probability of response on the other
schedule?

Could you post your code so I can see how you're doing this?

···

----------------------------------------------------------------------
A "not all commerce is crass" story. Yesterday I got a call from JDR
Microdevices. The woman told me that my Turbo Pascal 7.0 had
accidentally been shipped with someone else's order. She asked if it
would be all right to ship it to me Overnight Express for Saturday
delivery, no charge for shipping, of course. So now I'm happily waiting
for the UPS truck, and trying to think of something else to buy from
this rather nice company.
-----------------------------------------------------------------------
Best,

Bill P.