Accuracy, reliability, and timing of visual evaluations of decay in fresh-cut lettuce
Fig 4
Relationship between the composite reference standard (CRS) and 18 individual ratings performed by nine raters.
Orange and blue lines show the best-fit between CRS and two sets of ratings. Black dashed lines are identity lines that show the perfect agreement between CRS and individual ratings. Within each panel, values in the lower right corner show Pearson correlation coefficient (r), Lin’s concordance coefficient (ρc), and coefficient of bias (Cb) between two independent ratings of the same rater (measurement of repeatability, or intra-rater reliability). Values in the upper left corners show the same coefficients but between CRS and individual raters (measurements of accuracy). Accuracy of a rater is the mean of accuracies calculated for two ratings of the rater. R1 to R5 were experienced raters, while R6 to R9 were inexperienced raters.