Fig. 6 Relation between Q and other impact indicators.

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Presentation transcript:

Fig. 6 Relation between Q and other impact indicators. Relation between Q and other impact indicators. (A) ROC plot capturing the ranking of scientists based on Q, Ctot, h-index, , and N. Each curve represents the fraction of Nobel laureates versus the fraction of other scientists for a given rank threshold. The diagonal (no-discrimination line) corresponds to random ranking; the area under each curve provides our accuracy to rank high Nobel laureates. The ranking accuracy is reported in the legend, 1 being the maximum. Precision and recall as a function of rank are discussed in section S7. (B) Expected citations to the highest-impact paper, , for a scientist with parameter Q and N publications. The plot illustrates the very low chance of a low Q researcher to publish a high-impact paper. (C) Observed versus predicted growth of the h-index for scientists with different Q. The plot documents the agreement between the analytically predicted h-index (eq. S38, continuous line) and the observed value 〈h(N)〉, obtained by averaging the h-index for scientists with the same Q (circles). (D) Top: Growth of the h-index for two scientists with at least 200 papers and different Q as a function of the productivity N (blue circles), compared with the prediction of eq. S38 (red line). Bottom: For the two scientists in the top panels, we measure the cumulative number of citations as a function of N, Ctot (N), and compare with the prediction of eq. S39. The close agreement between observation and prediction in (C) and (D) shows that the time-independent Q captures an intrinsic property of a scientist and that other indicators, like the h-index or cumulative citations, are uniquely determined by Q and productivity. (E) For two scientists, we show the h-index prediction as a function of N using only early-career information, namely, N0 = 20 (top) and N0 = 50 (bottom), to estimate the Q parameter. Although the initial h-index up to N0 = 20 highly overlaps for the two scientists, their long-term impact diverges, a difference accurately predicted by the Q-model. (F) Scatterplots of predicted and real h-index at N = 60 based on Q estimated at N0 = 20. The error bars indicate prediction quartiles (25 and 75%) in each bin and are colored green if y = x lies between the two quartiles in that bin and red otherwise. The circles correspond to the average h-index in that bin. (G) The zN score for each scientist captures the number of SDs the real h-index deviates from the most likely h-index after N publications. zN ≤ 2 indicates that the real data are within the prediction envelope. Roberta Sinatra et al. Science 2016;354:aaf5239 Published by AAAS