Scatterplots
Introduction
Scatterplots are graphs that display bivariate data as a collection of points. The response variable is on the y-axis and the explanatory variable is on the x-axis.
Describing Scatterplots
To describe a scatterplot, one must address four features: direction, form, strength, and outliers.
1. Direction: Positive, negative, or zero association?
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Positive
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Negative
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Zero / No Association
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2. Form: Linear or non-linear relationship?
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Linear
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Non-linear
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3. Strength: Strong, moderate, or weak association?
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Strong
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Moderate
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Weak
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4. Outliers: Any extrema?
