AtlasSession 4L11: Graphical representation of data and measures of associationp.39, 50–51
Pearson vs Spearman
- 3 earlier topics
- Types of distribution
- Normal vs non-normal
- Graphs for quantitative data
- Scatter plots and correlation
- Pearson vs Spearman
Fig. 1
Chondrocyte–alginate constructs at day 21: seeding density (×10⁶ cells/mL) vs GAG/DNA (µg/µg)
Fig. 1: Chondrocyte–alginate constructs: seeding density vs GAG/DNA, 40 constructs; across: cells seeded, up: matrix made.
- Constructs
- 40
- Pearson (values)
- — (press Show the pattern)
- Spearman (places)
- — (press Show the pattern)
Chart Studio · First look
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Level 1 · First look · Lecture 11 · p.39, 50–51
Explain why a rank-based measure shrugs off one extreme value.
Choose Pearson's coefficient for normally distributed variables and Spearman's otherwise, and see why ranks resist skew and outliers.
Race times vs places (the step you are on)
A runner hours late wrecks the average time but is simply last.
A runner who finishes hours late wrecks the average finishing time, but in the results list they are simply last.