Visualizing a correlation with a third variable
WHAT IT TESTS: Bivariate viz plus confound awareness. OUTLINE: A scatter plot with a trend line shows the relationship; encode network type by color or facets to expose a lurking variable. RED FLAG: Treating the correlation as causal.
WHAT IT TESTS: Whether you pick the right chart for two continuous variables and reason about confounding. ANSWER OUTLINE: Plot load time on the x-axis against session duration on the y-axis as a scatter, with a regression line summarizing the negative slope. For network type, encode it as color on the scatter, or use small-multiple facets per network. This can reveal Simpson's paradox, where the pooled slope differs from within-group slopes. RED FLAG: Calling the correlation causal, or a bar chart that hides per-point structure.
Read the original → interview
- #data-visualization
- #scatter-plot
- #correlation
- #confounding
- #analytics
Get five bites like this every day.
Tezvyn delivers a daily feed of 60-second tech bites with quizzes to lock in what you learn.