proc arboretum

[Odair]

hi guys!

I come to you for aks something about proc arboretum. Which splitt criteria it does when doesnt put anyone critera in SPLIT statement?

thx.

[PadraicGNeville]

From The ARBORETUM Procedure documentation:

Criteria for Interval Targets

VARIANCE reduction in square error from node means

PROBF p-value of F test associated with node variances (default)

Criteria for Nominal Targets

ENTROPY Reduction in entropy

GINI Reduction in Gini index

PROBCHISQ p-value of Pearson chi-square for target vs. branches (default)

Criteria for Ordinal Targets

ENTROPY Reduction in entropy, adjusted with ordinal distances

GINI Reduction in Gini index, adjusted with ordinal distances (default)

[Odair]

Nice!

Other question: is it possible to arboretum split in three or more nodes?  I'm reading de proc arboretum but nothing show up.

Thank you so much!

[PadraicGNeville]

The MAXBRANCH= option is documented as an option to the TRAIN statement.  (" Any integer from 2 through 50 is permitted.") Options to the TRAIN statement are generally accepted as options to the PROC ARBORETUM statement also.