I was reading a paper and the authors describe a plot which they used to determine whether their estimator was unbiased. This plot is described as follows (verbatim):
To assess if the probabilities of taxonomic placement were unbiased, we ordered the classification probabilities from lowest to highest, and computed a cumulative sum of both these probabilities as well as the indicator variables describing whether the outcome predicted with highest probability was a correct one. We then plotted these two cumulative sums against each other. If the classification probabilities are unbiased, such a plot should follow the identity line.
Is there a specific name for this type of plot? Is there a reference which describes the theory justifying this plot?
Somervuo, P., et al. "Quantifying uncertainty of taxonomic placement in DNA barcoding and metabarcoding." Methods in Ecology and Evolution (2017): 398-407.