How does predict with ensemble regression works?

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Tania
Tania 2014-8-13
评论： Machine Learning 2015-2-10
This might be a silly question...iam using bagging with regression trees. I built for instance 10 different trees, then I average them. when I then use predict to predict my y value, how does it work? does it somehow average the fitted y values?!
thanks for your help!!

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Shashank Prasanna
Shashank Prasanna 2014-8-13
编辑：Shashank Prasanna 2014-8-13
For classification the output of the ensemble is the class that gets majority vote from all the learners. For regression the results are averaged.
http://www.mathworks.com/help/stats/ensemble-methods.html#bsw8at7
http://en.wikipedia.org/wiki/Bootstrap_aggregating
  2 个评论
Tania
Tania 2014-8-14
So for instance, if i have 10 observations and I built 5 different trees. i take all their predicted y values of the different trees and average them,yes?
Machine Learning
Machine Learning 2015-2-10
Short answer is yes.
However if you want a more accurate y you have to look into boosting.

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