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Spatial autocorrelations within choice model

Put in requests for new capabilities such as functions for new models.
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ha.ortiz10
Posts: 4
Joined: 02 Jun 2020, 23:17

Spatial autocorrelations within choice model

Post by ha.ortiz10 »

Hi! I would like to ask if someone has developed a choice model including spatial autocorrelation and if so, could you share your code. Thank you!
gregorymacfarlane
Posts: 11
Joined: 29 Oct 2020, 23:11
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Re: Spatial autocorrelations within choice model

Post by gregorymacfarlane »

I have not done this, but am also very interested in knowing how it might be done.
stephanehess
Site Admin
Posts: 974
Joined: 24 Apr 2020, 16:29

Re: Spatial autocorrelations within choice model

Post by stephanehess »

Hi

you would need to make a decision on what model to use for this. Options could for example include a nesting structure that groups together alternatives that are closer to each other, or you could use error components and make the correlation a function of distance between the alternatives. Both approaches could adapt methods from departure time work, such as OGEV for example

Stephane
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Stephane Hess
www.stephanehess.me.uk
gregorymacfarlane
Posts: 11
Joined: 29 Oct 2020, 23:11
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Re: Spatial autocorrelations within choice model

Post by gregorymacfarlane »

There are (at least) two different ways in which spatial correlation would show up in choice models.

1. Spatially correlated error between alternatives. This happens when there is some spatial attribute of the choice alternative, like in a destination choice model. That would seem to be handled with the GEV models that you suggest here, and that I have seen in Sener et al.http://citeseerx.ist.psu.edu/viewdoc/do ... 1&type=pdf and other places.

2. Spatially correlated utility between choice makers. This happens when the choice makers are located spatially, and the choices of one person affect the choices of others. Bhat https://ctr.utexas.edu/wp-content/uploads/DSTOP114.pdf appears to deal with this kind of thing.

I can see very readily how type 1. could be handled in apollo. Can type 2 be handled also? Is this what you mean by "you could use error components and make the correlation a function of distance between the alternatives"?
stephanehess
Site Admin
Posts: 974
Joined: 24 Apr 2020, 16:29

Re: Spatial autocorrelations within choice model

Post by stephanehess »

Hi

On point 1, yes, that's what I had in mind.

On point 2, you would have to think about coding this manually somehow, and using Apollo for estimation

Stephane
--------------------------------
Stephane Hess
www.stephanehess.me.uk
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