This is my survival tree program (STREE). It is free to use and distribute provided that (a) I bear no responsibility as the consequence of using this program although I welcome collaborations of using my program for data analysis; (b) the users must acknowledge the use of this STREE program; and (c) the users are recommended to cite my book: H.P. Zhang and B. Singer. (1999) Recursive Partitioning in the Health Sciences, Springer, New York. Thanks. Heping Zhang (December 7, 2000) 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 survival time; and "c" is for censoring indicator (1=death, 0=alive). sample.inf: The output file. The file can be read as follows: Column 1: node number. Node 1 is the root node. Column 2: number of subjects in the node, e.g., 2418 subjects in node 2. Column 3: left daughter node, e.g. node 2 is the left daughter node of node 1. Column 4: right daughter node, e.g. node 3 is the right daughter node of node 1. Column 5: The splitting variables. For example, variable 1 splits node 1. Column 6: The splitting value corresponds to the splitting variable. sample.ps: A postscript file for the final tree that can be viewed or printed. For each node on a tree, median survival time and death rate are printed. You have to make your own survival curves within the terminal nodes. Final notes: I won't be surprised that you might have questions when you try to use this program. I would appreciate your understanding for not asking me questions, because this is a freeware.