topic Re: Hypothesis testing with ASE? in SAS Data Science

Hypothesis testing with ASE?

Benjamin8 — Sun, 24 Jan 2016 15:01:05 GMT

Hello,

I analyse texts with Text Mining in SAS EM and already did a decision tree plus a logistic regression.

As a result I am getting e.g. an average square error (ASE). Can this indicator sufficently accept a hypothesis?

Or are there better indicators?

Thanks, in advance and hope you have an idea.

Kind regards,

Benjamin

Re: Hypothesis testing with ASE?

M_Maldonado — Mon, 25 Jan 2016 11:25:48 GMT

Hi Benjamin,

More context please.

What does your Text Mining flow look like? And what are you trying to predict?

A general walk-through of your data and your goal would be nice too!

Thanks,

Re: Hypothesis testing with ASE?

Benjamin8 — Mon, 25 Jan 2016 11:55:51 GMT

Hi Migual,

The Text Mining flow contains nothing special. In detail it contains Text Parsing-, Text Filter-, Text Topic-,Text Cluster-, Data Partition-, Decision Tree- and Regression-Node. I try to determine, if the text topics (independent var.) can explain a metrical targer variable (e.g. company size). A null hypothesis could be: There is no correlation between the text topics and the company size.

Hope this make things clearer.

Re: Hypothesis testing with ASE?

Funda_SAS — Mon, 25 Jan 2016 15:44:35 GMT

H Benjamin,

ASE is an estimate of model's mean squared error and it is not directly used for hypothesis testing. For example, in predictive modeling, you can use your model’s ASE on training and validation data to get an indication of overfitting. If your goal is overall hypothesis testing (between the target and all of the input variables), then you need to look at the overall p-value in the ANOVA table (available as on output of the Regression node). Total variance explained by the model and the model’s ASE (also degrees of freedoms of the model) are used together to calculate this p-value.

Hope this helps!

Funda

Re: Hypothesis testing with ASE?

Benjamin8 — Mon, 25 Jan 2016 17:35:01 GMT

Hi Funda,

This sounds very good to me, the p-value is what I have been seeking for. I will try this.

Thank you.

Kind regards,

Benjamin

Re: Hypothesis testing with ASE?

Benjamin8 — Tue, 26 Jan 2016 17:57:41 GMT

Hi,

I tried this at SAS EM, but unfortunately I couldn't find the mentioned ANOVA table (with the p-value) of the Regresssion node.

Where can I find this table?

Best regards,

Benjamin

Re: Hypothesis testing with ASE?

Funda_SAS — Tue, 26 Jan 2016 18:59:18 GMT

ANOVA (Analysis of Variance) table is avalibale as an output of the regression node. P-value is shown by the pink arrow

Re: Hypothesis testing with ASE?

Benjamin8 — Tue, 26 Jan 2016 19:10:36 GMT

OK, I was in the wrong node (decision tree) 😉 Now I've found it.

Thank's again.