Is there any recent method to assess the population structure/ community structure based on categorization of individuals in different girth classes ?

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Andrew Paul McKenzie Pegman

Yes, DBH class structure :)

https://www.nature.com/articles/srep06873

Shujaul Mulk Khan

DBH classes can be establushed and data can be classified via PCORD or R softwares.

Abhijit Mitra

You can refer this paper

Surendra Singh Bargali

See the paper/reference Good and Good 1972 and Umashankar 2001 -current Science

Gopal Shukla

Useful discussion

you can consult this book