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Algorithms Used: Linear regression, CART and random forest.
Data preparation/Model training: During data exploration, I determined that some records were invalid due to a key variable being out of bounds. After removing this spurious data, I imputed values that were missing.
Result: My final rank in the competition was 110 out of 2875 competitors (within the top 4% of competitors). I attribute my high rank to my data preparation since the algorithms used and the training were straightforward.