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education/statistics/Correlation and Regression.md
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@ -58,4 +58,5 @@ https://www.thoughtco.com/how-to-calculate-the-correlation-coefficient-3126228
- $r$ is not a linear, perfect scale. An $r$ of 0.8 does not mean twice as much linearity as an $r$ of 0.4 - $r$ is not a linear, perfect scale. An $r$ of 0.8 does not mean twice as much linearity as an $r$ of 0.4
### Ecological Correlations ### Ecological Correlations
- Sometimes each point on the plot represents the average or rate for a whole group of individuals. - Sometimes each point on the plot represents the average or rate for a whole group of individuals.
- Ecological correlations are artificially strong - Ecological correlations are artificially strong
- The size of points may indicate the size of the datapoints