Attribute weight help

页

Hi,
I'm working with decision trees, I’m trying to understand the factors must important that conducts to a sewer pipe failure, my records have attributes like diameter , length, etc. I have an attribute whit the number of failures in that pipe, I think this information can be use like a weight. Because the data is unbalanced most of the examples have a value 0. If I use “set rule” to set this attribute as weight, the tree becomes completely trained and useless, so I have to get out this attribute to get results. So my question is, is there a way to use this information without over training the tree.

Thanks for your attention,
Paulo Praça

MartinLiebig

Have you considered to put the role of that attribute to weight?

~Martin

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yes I put, but the tree get overtraining, when I did that the tree only have two leaves. The failure range frequency varies between 1 and 6, maximum i have 6 failures in one pipe but for almost every one I have only one failure. IF I put this attribute as ‘weight’ he shadows the others attributes.

MartinLiebig

I think we have a different understanding of overtraining. I guess your tree simply gets worse by this.

Have you tried to change the minimal gain?

JEdward

如果你离散场和使用它as the label?

For example:
Faults
0
1
2-3
4-5
6+

Or even more simply Faults: Low, Medium, High.