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How can I calculate conditional mean in R? For example, I have two variables Amount and Class. Class is a binary variable taking values of

How can I calculate conditional mean in R? For example, I have two variables Amount and Class. Class is a binary variable taking values of 0 and 1 and I want to find the mean of Amount based on 0 and 1. Why is mean(Amount[Class=1]) or mean(Amount[Class=0]) wrong? Why is there even a value for mean(Amount[Class=2])?

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