Could you please provide some more information? Have you tried any correlation tests? Parametric or non-parametric, and if so, was the result unsatisfactory?
Depending on your data you could try Pearson Correlation, Spearman Correlation or another test. If your using python check the functions provided by scipy here
Furthermore, please do a more comprehensive search on this stack. This has too be a duplicate question. (e.g Correlation issue)