Stree description

Welcome to Stree Homepage

Description:

Stree is a tree program for survival analysis. The Stree program implements the ideas expressed in the book:

· H.P. Zhang and B. Singer. (1999) Recursive Partitioning in the Health Sciences, Springer, New York.

Example:

stree*: These are the executable codes compiled on various systems. You can type in the datafile name as a parameter. Assume the missing values are either "." or "NA".
sample.dat: This is a sample data file. The first row indicates the type of covariates. "d" implies deleting that covariate from the analysis; "o" implies a continuous or an ordinal covariate; "n" implies a nominal covariate; "r" implies the outcome; "c" is for censoring indicator (1=death, 0=alive).
sample.inf: This is the output file of sample.dat. The file can be read as follows:

Ø Column 1: node number. Node 1 is the root node.

Ø Column 2: number of subjects in the node, e.g., 2418 subjects in node 2.

Ø Column 3: left daughter node, e.g. node 2 is the left daughter node of node 1.

Ø Column 4: right daughter node, e.g. node 3 is the right daughter node of node 1.

Ø Column 5: The splitting variables. For example, variable 1 splits node 1.

Ø Column 6: The splitting value corresponds to the splitting variable.

sample.ps: The postscript file for the final tree that can be viewed and printed.

Versions:
The latest version is revised on Dec 7, 2000. We provide executable files for three platforms.

Download STREE:

Please read the license agreement.

This program is free to use and distribute provided that

I bear no responsibility as the consequence of using this program although I welcome collaborations of using my program for data analysis.
The users must acknowledge the use of this STREE program, and it is important to distinguish this STREE program from any other commercial programs.
The users are recommended to cite my book in their publications:

Please report bugs or any comment to strees@masal.med.yale.edu Thank you!