H index, also known as H index or H factor, is a new method to evaluate academic achievements.

H stands for "high citation", and a researcher's H index means that he has at most H papers cited at least H times. H index can accurately reflect a person's academic performance. The higher a person's H index, the greater the influence of his thesis. For example, someone's H index is 20, which means that 20 papers have been published, and each paper has been cited at least 20 times. It is very easy to determine a person's H index. Go to the SCI website, find out all SCI papers published by a person, arrange them from high to low according to the number of citations, and look down until the serial number of a paper is greater than the number of citations. That serial number minus 1 is the H index.

Hawking, who is familiar to readers in China, has an H index as high as 62. Among biologists, Schneider, a neurobiologist and wolf prize in medicine winner from Johns Hopkins University, has the highest H index, and gundam 19 1, followed by Baltimore, a biologist from California Institute of Technology who won the Nobel Prize in Physiology or Medicine, 160. Biologists' H index is on the high side, which shows that H index, like other indicators, is not suitable for interdisciplinary comparison.

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