the four impact factors are linearly correlated with each other in pairs

The statement is not entirely accurate. While it is true that some impact factors may be correlated with each other, it is not necessarily a linear correlation and not all four factors are guaranteed to be correlated with each other.

For example, the impact factor of a journal may be correlated with the number of citations it receives, but may not be correlated with the immediacy index or the article influence score. Additionally, the correlation between two factors may not be linear and may be influenced by other variables.

Therefore, it is important to consider each impact factor separately and not assume that they are all correlated in a linear manner