pearson’s product moment correlation coefficient, PMCC

• measures the strength of linear correlation between two variables
• PMCC also between -1 and 1
• It is calculated using actual data values and not ranks so can be used for data that can’t be ranked – don’t worry you won’t have to calculate PMCC
•  If r near 1, there is a strong positive correlation
• If r = 0, there is zero correlation
• If r near -1, there is a strong negative correlation