Could you recommend me a book or scientific article that explains the interpretation of the results of a Spearman correlation analysis (SC)? For example, I need a reference in the literature that says:
SC = 0.5 is weak
SC < 0.7 is average
SC > 0.8 is strong
SC > 0.9 is very strong
I need it for a research paper, then to be something more "serious" than a web site.
[UPDATED after whuber´s help]: To be more specific, I'm using SC to evaluate an Information Retrieval System. I need to "correlate" the Rank result of my system against a rank calculated by some specialist.