Your H Index determined by ResearchGate is 13, see https://www.researchgate.net/profile/Anthony-Howell-5/stats. However, the list of citations found by RG may not be complete. Other platforms like Google Scholar may have found more, and this may lead to a higher H Index. None of the platforms have all publications available, therefore many citations are not found. In addition, the automated algorithms to identify citations are not perfect. See also https://www.researchgate.net/post/Why_citation_score_for_author_publications_looks_different_on_Scopus_research_gate_google_scholar for more information.

Dear Anthony Howell The (huge) difference between that what you find here on RG and Google Scholar is mainly because there are multiple profiles here on RG:

https://www.researchgate.net/profile/Anthony-Howell-5 (h-index 13)

https://www.researchgate.net/profile/Anthony-Howell-6 (h-index 137)

Furthermore, it might be worthwhile to check the various uploads of the papers you published (and if they are part of your profile), see for example:

Polygenic risk scores for prediction of breast cancer and breast cancer subtypes

Unfortunately, as indicated by Wolfgang R. Dick the algorithm(s) used by RG are not perfect and you have to (where possible) correct things manually:

-See how to merge profiles https://help.researchgate.net/hc/en-us/articles/14292803187473-Duplicate-profiles

-See how to merge publications and/or claim authorship https://help.researchgate.net/hc/en-us/articles/14292798510993-Authorship

This way the h-index showed on RG and for example Google Scholar will be more alike although GS in most cases display the highest number of citations (and h-index).

Best regards.

The h-index is a metric that relates the number of published papers and the number of times an author is cited. It attempts to find a balance between academic "production" and "impact". It is a widespread metric due to its ease of calculation, although it also has its limitations.