Seojin Nam - 2022-08-23

Dear Prof. Chen,
It's my first time using Citespace and I had a question regarding the years assigned to each node in a timeline visualization.

I'm trying to analyze three different node types: 1) keyword co-occurrence analysis (CO-DESC), 2) journal co-citation analysis (JCA), 3) document co-citation analysis (DCA) using publications from 2012 to 2022
and I'm a bit confused about the years assigned to each node in the timeline view.

At first I thought it was the year a certain keyword or journal/document first appeared or was first cited but after looking at some nodes, the year in the timeline doesn't seem to fit this or the beginning year of the burst or (in the case of DCA) the publication year.

For example, the timeline view year of the journal SCI REP-UK is 2015, though according to the burst history it was first cited in 2012 and the beginning year of the burst is 2020. CO-DESC also had cases like this where the timeline view year of a keyword didn't match its first appearance year or the beginning burst year.

I'm thinking maybe it's the average year of the total publications that (in the case of CO-DESC) the keyword appeared or (in the case of JCA/DCA) the journal or document was cited..?

I would really appreciate it if you could clarify this for me. Thank you very much for your support!

Best regards,
Seojin Nam