Co-citation Frequency

Co-citation frequency refers to how often two sources, like books or articles, are mentioned together in other works. For example, if both a biology textbook and a research paper are frequently cited in the same articles, they have a high co-citation frequency. This can indicate that the two sources are related in topic or influence each other in their fields. Researchers use co-citation frequency to understand connections between ideas, identify key works in a discipline, and analyze how knowledge evolves over time.