Re: Decision Tree refuses to grow
what tree algorithm are you using?
I don't know how tree algorithm works in sas/ Eminer. but split method
of some tree algorith doesn't depends on p-value at all, such as CART.
My suggestion is to check the default setting of your program. A study
indicates that analysis result is highly sensitive to the default
setting of software, which is pretty interesting.
On 11/29/06, firstname.lastname@example.org <email@example.com> wrote:
> Silly question that's likely to show I'm overlooking something simple,
> but I'm stumped. I have a dset of approx 8M observations and I'm
> trying to grow an EMiner decision tree on a binary target variable.
> There are about 20 independent variables, mostly interval (dates), but
> some nominal, a few binary and one ordinal. The proportion of true
> events is about 12%. I have not set any prior probabilities, nor
> profit/cost values.
> The tree runs, but returns no splits. It just won't grow. I've tried
> dropping the signif value to .00001, using upwards of 11 maximum
> branches and my max depth to 10. I also tried having the tree build on
> as few as 2 IVs.
> I was able to build a tree when I took a sample of 100K records and
> forced the %age of true events in the sample to be 50%. Naturally I
> don't want to misrepresent the proportion, and I figured that 12%
> wasn't terribly rare for a d-tree.
> Am I outright doing something wrong or is this expected behavior?
Senior Decision Support Analyst
Cincinnati Children Hospital Medical Center
|Thread||Thread Starter||Forum||Replies||Last Post|
|Re: Decision Tree refuses to grow||David L Cassell||Newsgroup comp.soft-sys.sas||0||12-01-2006 05:44 AM|
|Decision Tree refuses to firstname.lastname@example.org||Newsgroup comp.soft-sys.sas||1||11-30-2006 03:22 PM|
|Re: Decision Tree refuses to grow||Peter Flom||Newsgroup comp.soft-sys.sas||0||11-29-2006 08:13 PM|
|Re: Decision Tree refuses to grow||Sigurd Hermansen||Newsgroup comp.soft-sys.sas||0||11-29-2006 08:01 PM|
|Which Decision Tree?||iris||Newsgroup comp.soft-sys.sas||0||08-09-2006 02:38 PM|