Improving Prediction Accuracy Based On Optimized Random Forest Model with Weighted Sampling for Regression Trees
||International Journal of Computer Trends and Technology (IJCTT)||
|© 2015 by IJCTT Journal|
|Year of Publication : 2015|
|Authors : S. Bharathidason, C. Jothi Venkataeswaran|
|DOI : 10.14445/22312803/IJCTT-V21P105|
S. Bharathidason, C. Jothi Venkataeswaran "Improving Prediction Accuracy Based On Optimized Random Forest Model with Weighted Sampling for Regression Trees". International Journal of Computer Trends and Technology (IJCTT) V21(1):23-28, March 2015. ISSN:2231-2803. www.ijcttjournal.org. Published by Seventh Sense Research Group.
Random Forest (RF) is an ensemble, supervised machine learning technique useful for regression and classification problems. Random forest algorithms tend to use a simple random sampling of observations in building their decision trees. In random forest, random selection has the chance for noisy and outlier data to take place during the construction of trees. This leads to inappropriate and poor ensemble prediction decision. Appropriately handling noise and outliers is an important issue in data mining. This paper aims to optimize, the sample selection through probability proportional to size sampling (weighted sampling) in which the noisy and outlier data points are down weighted to improve the prediction performance by minimizing the error rate in the model. Experimental results have shown that, the random forest can be further enhanced in terms of minimizing the prediction error with weighted sampling.
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Random Forest, Weighted sampling, Decision trees, Noisy data, Outlier.