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In the Correlations section, pairwise correlation of gene expression levels can be calculated and represented.
Correlation is a technique for investigating the relationship between two quantitative, continuous variables. Values of the correlation coefficient are always between -1 and +1. A correlation coefficient of +1 indicates that two variables are perfectly related in a positive linear way, a correlation coefficient of -1 indicates that two variables are perfectly related in a negative linear way, and a correlation coefficient of 0 indicates that there is no linear relationship between the two variables.
Specifically, this option of CANCERTOOL provides the results in two different modalities:
Please, if you have any doubt, check the manual.