Notes

Measures of Asymmetry

• Skewness
  • Whether the data is concentrated on one side.
  • The direction of the skew is counterintuitive.
  • Positive (Right) Skew
    • Right skewness, means the outliers are on the right.
    • Mean is bigger than the median
    • Mode is the value with the highest visual representation
    • Picture
  • Zero Skew
    • Mean = Median = Mode
    • Picture
  • Negative (Left) Skew
    • Left skewness, means the outliers are on the left.
    • Mean is smaller than median
    • Picture
  • Skewness tells us where the data is situated.
  • Link between central tendency measures and probability theory, which allows us to get a more complete understanding on the data.

Course Materials

2.8.+Skewness_lesson.xlsx