Correlation charts are often associated with causality and they should be used with caution.
Correlation can show:
- increases with
- relates to
- changes with
- varies with
- caused by
Anscombe’s quartet is a powerful illustration of the drawback of relying solely on basic descriptive statistics to summarise data. The data in all four of the graphs in the quartet are virtually identical when using standard descriptive methods. Looking at your data before analysing it is something that Anscombe was passionate about.
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