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Using Mean to Guess Availality on Boolean Data before munging

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@sridar wrote:

On the loan data tutorial : Here
The assumption : “***We can also look that about 84% applicants have a credit_history. How? The mean of Credit_History field is 0.84 (Remember, Credit_History has value 1 for those who have a credit history and 0 otherwise)***” , is correct to which extent?

See this,
image

I think it should be 77% of applicants have credit history. (If we are considering missing values too).

Please correct me if I’m wrong.

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