Applied Statistics - 3.1 - Outliers Flashcards by Anduen Tahiri-Mehmeti

Q

What are they, how to calculate

Outliers

A

An extreme value that lies outside the overall pattern of the data
Over Q₃: Q₃+ 1.5(Q₃ - Q₁)
Under Q₁ : Q₁ - 1.5(Q₃ - Q₁)

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Q

Why is it important to keep outliers in data?

A

Outliers may indicate natural variation and is still a piece of data to keep
May be the result of errors in measuring or recording data

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Q

What is Cleaning the Data?

A

Removing anomalies from a data set

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Q

How to calculate outliers using standard deviation

A

Calculate mean
Calculate standard deviation (square root of variance)
Mean +/- standard deviation = outliers

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