Columns :
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age: age of primary beneficiary
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sex: insurance contractor gender, female, male
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bmi: Body mass index, providing an understanding of body, weights that are relatively high or low relative to height,objective index of body weight (kg / m ^ 2) using the ratio of height to weight, ideally 18.5 to 24.9
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children: Number of children covered by health insurance / Number of dependents
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smoker: Smoking
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region: the beneficiary's residential area in the US, northeast, southeast, southwest, northwest.
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charges: Individual medical costs billed by health insurance.