outlier calculations

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10 Terms

1
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calculate IQR

IQR = Q3 - Q1

2
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Q3

75th percentile

3
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Q1

25th percentile

  • 25% of the values the distribution lie at or below

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how to calculate Q1

median of the median (left side)

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how to calculate Q3

median of the median (right side)

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calculate inner fences (potential outliers)

  • Q1 - (1.5 x IQR)

  • Q3 + (1.5 x IQR)

    • Assume “x” is the value we think might be an outlier

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calculate outer fences (extreme outliers)

  • Q1 - (3 x IQR)

  • Q3 + (3 x IQR)

    • Assume “x” is the value we think might be an outlier

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Q2

50th percentile

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what is a potential outlier

  • Inner fences

    • If “X” is less than: Q1 - (1.5 x IQR)

    • If “X” is greater than: Q3 + (1.5 x IQR)

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what is an extreme outlier

  • If “x” is less than: Q1 - (3 x IQR)

  • If “x” is greater than: Q3 + (3 x IQR)