# Michael S. Rosenberg’s Laboratory

Computational Evolutionary Biology & Bioinformatics

E-mail: msr@asu.edu
← Back to introduction

## hpd-index

The hpd-index (Kosmulski 2009) is very similar to the h-index, except that it adjusts for the age of a publication. Rather than adjust per year, the metric is adjusted per decade. Thus if

$$cpd_i=\frac{10C_i}{Y-Y_i+1}$$

is the number of citations an article has per decade (where Y is the current year), then the hpd-index for an author is the largest rank for which hpd of their publications (ranked by cpdi rather than Ci) have cpdhpd.

$$hpd=\underset{i}{\max}\left(i \leq cpd_i\right)$$

### Example

Publications are ordered by adjusted number of citations, from highest to lowest.

 Citations (Ci) Age (Y − Yi + 1) Adjusted Citations (cpdi) Rank (i) 36 42 14 11 2 9 9 2 1 2 3 1 1 0 0 0 2 5 5 4 1 5 5 2 1 3 5 2 2 2 1 1 180.00 84.00 28.00 27.50 20.00 18.00 18.00 10.00 10.00 6.67 6.00 5.00 5.00 0.00 0.00 0.00 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 hpd = 9

The largest rank where icpdi is 9.

Yearhpd
19972
19985
19995
20007
20019
200212
200315
200416
200519
200621
200722
200824
200924
201027
201128
201229
201329
201430
201530
201630
201730

## References

• Kosmulski, M. (2009) New seniority-independent Hirsch-type index. Journal of Informetrics 3:341–347.