@conference { Teller:1997:acnf, title = {Automatically Choosing the Number of Fitness Cases: The Rational Allocation of Trials}, editor = {John R. Koza and Kalyanmoy Deb and Marco Dorigo and David B. Fogel and Max Garzon and Hitoshi Iba and Rick L. Riolo}, year = {1997}, month = {"13-16 " # jul}, pages = {321--328}, publisher = {Morgan Kaufmann}, type = {inproceedings}, address = {Stanford University, CA, USA}, abstract = {For many problems to which genetic programming has been applied, choosing the number of fitness cases with which to evaluate the individuals is a crucial decision. If too few fitness cases are used, overfitting may occur, and the measured fitness of an individual may not be representative of its true fitness. On the other hand, if too many fitness cases are used, a great deal of computer time can be wasted. This paper presents a method for the Rational Allocation of Trials (RAT) that dynamically allocates a boundedly optimal number of fitness cases for each individual. RAT allocates individuals to tournaments prior to their evaluation, and then, borrowing from previous work in model selection, allocates trials (fitness cases) only to those individuals for whom the cost of evaluating another fitness case is outweighed by the expected utility that the new information will provide. For most evolutionary computation approaches, including genetic programming, and for most problems, the RAT algorithm will provide significant time savings at minimal additional system complexity.}, keywords = {genetic algorithms, genetic programming}, URL = {http://www.cs.cmu.edu/afs/cs/usr/astro/public/papers/GR.ps}, author = { Teller, Astro and Andre, David} }