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Machine learning algorithms build a model of the training data. The term "machine learning" is vaguely defined; it includes what is also called statistical learning, reinforcement learning, unsupervised learning, etc. ALWAYS ADD A MORE SPECIFIC TAG.

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Is it a valid technique to exclude features based on occuring very rarely? Or would it be be...

I have a large sparse binary dataframe with codes from health data. The train columns are one-hot-encoded ICD Codes, OPS Codes, ATC Codes, and other covariates such as age etc. (scaled to be between …