# Michael S. Rosenberg’s Laboratory

Computational Evolutionary Biology & Bioinformatics

E-mail: msr@asu.edu
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## R-index

The R-index (Jin et al. 2007) is a measure of the quality of the Hirsch core, designed to avoid punishing scientists with larger cores. As a simple arithmetic average, the a-index has the size of the core in the divisor and therefore can lead to smaller values for scientists with much larger cores than those with much smaller cores (this is not an issue of the indices are only being used to compare those with similar sized cores). The R-index uses the square-root of the citations in the core rather than average:

$$R=\sqrt{C^H}=\sqrt{\sum\limits_{i=1}^{h}{C_i}}.$$

YearR
19971.0000
19983.0000
19995.5678
20007.6158
200111.0000
200214.3527
200317.6918
200422.5167
200527.3496
200632.3574
200736.8375
200841.5331
200946.6798
201050.9510
201154.7266
201257.8619
201361.5792
201465.5134
201568.7605
201671.8123
201773.7767

## References

• Jin, B., L. Liang, R. Rousseau, and L. Egghe (2007) The R- and AR-indices: Complementing the h-index. Chinese Science Bulletin 52(6):855–863.