StatQuest: Random Forests Part 2: Missing data and clustering

NOTE: There is an updated version of this video!!! The new version corrects two small errors listed below: See: https://youtu.be/sQ870aTKqiM

Last time we talked about how to create, use and evaluate random forests. Now it's time to see how they can deal with missing data and how they can be used to cluster samples, even when the data comes from all kinds of crazy sources.

NOTE: At 10:22 I overlooked one step. In this case, you plug in the most common value/median value for all observations in the training dataset that have that same category as the new copy that you created. For example, we created two new copies of the observation: one with with heart disease and one without heart disease. Now, for the new copy with heart disease, we plug in the most common value from the observations in the training dataset that have heart disease. For the new copy without heart disease, we plug in the most common value from the observations in the training dataset that do not have heart disease. We can then use the iterative method to refine the guess if we want, or we can just run those two copies down the tree and use the classification from the copy that got the most correct votes.

NOTE: This StatQuest is based on Leo Breiman's (one of the creators of Random Forests) website: https://www.stat.berkeley.edu/~breiman/RandomForests/cc_home.htm

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Видео StatQuest: Random Forests Part 2: Missing data and clustering канала StatQuest with Josh Starmer