Comparing Indicators
The double map atlas enables you to view two indicators at the same time and to determine if there is any correlation (association) between the two based on the Primary Care Trust values. The graph of the cross-plot of the two selected indicators contains a 'regression' line to summarise the relationship. Note:
- Use the 'correlation coefficient' value above the line to determine the strength of association.
- A positive or negative value between 0.3 to 0.5 could be interpreted as a 'medium' association, and between 0.5 and 1 a 'large' association.
- a positive value means that as one indicator value increases the other increases (a 'positive relationship', line slopes upwards from left to right).
- a negative value means that as one indicator value increases the other decreases (an 'inverse relationship', line slopes downwards from left to right).
- correlation does not imply causation, only an association — some other factor may be influencing both issues.
- indicator years being compared may differ.