← Back to introduction

h2-upper index

The h-index describes an h×h square under the citation curve containing h2 citations. Bornmann et al. (2010) suggest dividing the citation curve into three sections based on this square and describing each section as the percent of all citations found within the section.

The h2-upper index is the percent of excess citations found within the h-core citations, i.e., the citations found above the h-square. It is calculated as:$$h_\text{upper}^2=\frac{C^H - h^2}{C^P}\times 100=\frac{\sum\limits_{i=1}^{h}{C_i} - h^2}{C^P}\times 100=\frac{e^2}{C^P}\times 100.$$

History

Year\(h_\text{upper}^2\)
19970.0000
199825.0000
199963.6364
200058.8235
200165.5405
200261.2403
200360.6516
200464.6322
200566.3482
200670.9845
200771.6601
200873.4902
200973.8069
201075.0373
201175.1726
201274.9315
201376.9356
201478.4751
201579.2722
201680.6615
201780.6986
201881.5403
201982.2300
202082.2126
202182.2186
202282.1474
202382.6209
202482.6510
202581.9320

References