topic Re: Narrowing Inputs - Prediction Model w/ Poisson distributed target in SAS Data Science

Narrowing Inputs - Prediction Model w/ Poisson distributed target

teg_76 — Wed, 09 Dec 2015 21:30:00 GMT

Hi,

I'm new to use Enterprise Miner, and Predictive Modeling in general, but have a stats background. I have a dataset with about 100 inputs and a target variable with a discrete Poisson distribution. I'd like to know:

1) Can I use a decision tree model in EM to help me narrow down inputs for a Poisson Model?

2) Can EM model a Poisson distribution, without using the "Rate Making" node (I don't have this node)?

Please let me know what additional information you need to help me answer my questions.

Thank you!

Re: Narrowing Inputs - Prediction Model w/ Poisson distributed target

M_Maldonado — Wed, 09 Dec 2015 21:34:36 GMT

Hi,

What version of Enterprise Miner do you have?
What are you trying to model? Just asking to confirm your discrete target is nominal.

Thanks!

Re: Narrowing Inputs - Prediction Model w/ Poisson distributed target

WendyCzika — Wed, 09 Dec 2015 21:37:43 GMT

Hi there...

1) Yes, decision trees make no assumptions about the distribution of your target and are very robust, so you can certainly use that for variable selection

2) That depends... what version of Enterprise Miner do you have?

Re: Narrowing Inputs - Prediction Model w/ Poisson distributed target

teg_76 — Wed, 09 Dec 2015 22:42:30 GMT

Thank you Miguel. I'm using EM 13.1.

My discrete target is ordinal, with a minimum of 1.

Re: Narrowing Inputs - Prediction Model w/ Poisson distributed target

teg_76 — Wed, 09 Dec 2015 22:43:50 GMT

Thank you Wendy for your reply. I'm using EM 13.1

Re: Narrowing Inputs - Prediction Model w/ Poisson distributed target

WendyCzika — Wed, 09 Dec 2015 23:41:13 GMT

Oh great, then you can use the HP GLM node (on the HPDM tab) - set the level of your target as interval (even though it is integer-valued) and by default, the HP GLM node will use the Poisson probability distribution with a log link function.

Re: Narrowing Inputs - Prediction Model w/ Poisson distributed target

teg_76 — Thu, 10 Dec 2015 00:07:17 GMT

Great...thank you Wendy!