AtlasSession 4L11: Graphical representation of data and measures of associationp.22–24, 39
Scatter plots and correlation
- 2 earlier topics
- Distribution of data
- Types of distribution
- Normal vs non-normal
- Graphs for quantitative data
- Scatter plots and correlation
Fig. 1
Bone-marrow MSC donors: age (years) vs CFU-F colonies per 10⁶ nucleated cells
Fig. 1: Bone-marrow MSC donors: age vs CFU-F, 80 donors; across: age, up: colonies.
- Donors
- 80
- Correlation
- — (press Show the pattern)
- Pattern
- — (press Show the pattern)
Chart Studio · First look
no point has been moved
Level 1 · First look · Lecture 11 · p.22–24, 39
Read a scatter plot and describe the direction and strength of a relationship in words.
Read a two-way scatter plot, fitted line and scatterplot matrix, and describe the direction and strength of association a correlation coefficient summarises.
Kids' heights (the step you are on)
Older children tend to be taller, so dots drift upward to the right.
Older children tend to be taller, so a plot of age against height drifts up to the right. Here each dot is a bone-marrow donor instead.