Quantifying the Effects of Correlated Covariates on Variable Importance Estimates from Random Forests

Recent advances in computing technology have lead to the development of algorithmic modeling techniques. These methods can be used to analyze data which are difficult to analyze using traditional statistical models. This study examined the effectiveness of variable importance estimates from the random forest algorithm in identifying the true predictor among a large number of candidate predictors. A simulation study was conducted using twenty different levels of association among the independent variables and seven different levels of association between the true predictor and the response. We conclude that the random forest method is an effective classification tool when the goals of a study are to produce an accurate classifier and to provide insight regarding the discriminative ability of individual predictor variables. These goals are common in gene expression analysis, therefore we apply the random forest method for the purpose of estimating variable importance on a microarray data set.

Name thesis:degree_name

Master of Science

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Biostatistics

Year dc:date.available

2006

Author dc:creator

• Kimes, Ryan Vincent

Contributors dc:contributor

• Dr. Kellie J. Archer

• algorithmic modeling
• data analysis
• algorithm
• random forest method
• Biostatistics
• Physical Sciences and Mathematics
• Statistics and Probability

Statement dc:rights

• © The Author

Identifier

https://scholarscompass.vcu.edu/etd/1433

OAI identifier oai:identifier

oai:scholarscompass.vcu.edu:etd-2432