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Pearson's Product Moment Correlation Co-efficient

bred

Posted 30 May 2007 - 05:05 PM

- Used when a higher degree of accuracy is required than Spearman's.
- This is a parametric test so the data has to be normally distributed.
- Actual values (not ranked data) are used therefore a regression line can be calculated and poltted to show the exact relationship between the two sets of variables. This is more accurate than drawing a "best fit line" on a scattergraph, which is the best you can do with Spearman's.
- If the data is large, Pearson's can be difficult to work with and the likelihood of human error is greater. In that case Spearman's is probably best used.

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