Sensory Evaluation for Cosmetics

Method CorrelationFinding Associations• Correlation coefficient r is always between –1 and +1• A correlation close to 0 means no linear relation• A correlation close to 1 or –1 (< ‐0.75 or > 0.75) suggests a strongassociation between the two data sets• Correlations in the range (0.5 to 0.75) and (‐0.75 to ‐0.5) are moderate• Correlations between ‐0.5 and 0.5 are weak• R 2 is squared correlation; a measure of ‘goodness of fit’P&G beauty & gromming 24