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Where to define prior probabilities?

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Occasional Contributor
Posts: 11

Where to define prior probabilities?

Hello,

in an enterprise miner project we are analyzing a sample which has much more cases than reality.

Therefore we want to use prior probabilities.

In our project we are using the following nodes: sample, data partition, decision tree and model comparison.

Is it enough to define the prior probabilities in the first node, the sample node?

Does the decision tree node later on use the prior probabilities defined in the sample node?

Or do we have to define the prior probabilities in every node?

Thanks for your help!

badikidiki

Super Contributor
Posts: 337

Re: Where to define prior probabilities?

Posted in reply to badikidiki

Hi,

Check out this tip, we do something similar to what you are trying to do.

https://communities.sas.com/docs/DOC-10220

I hope it helps,

Miguel

Occasional Contributor
Posts: 11

Re: Where to define prior probabilities?

Posted in reply to M_Maldonado

Hi Miguel,

thank you very much for your answer!

I will try to use the decision node.

But I wonder what the Miner does without a decision node.

My first try was to define prior probabilities in my sample node.

After that I ran a data partition, different decision trees and a model comparison node.

Do prior probabilities defined in the sample node - without having a decision node - effect the following nodes or not?

badikidiki

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