Can someone explain to me the "predictability" tab?

For example, if searching IGF1R, what does “importance” mean? and “correlation”? What is a negative correlation? Does “expression” refer to mRNA or proteomic data?

I believe answers to most of these questions can be found in the documentation linked at “information about this page”

One that we don’t answer there is about what “expression” refers to. In general, on the portal when we label data as “expression” it’s referring to the level of mRNA expressed. When we’re talking about the expression of protein, we label that data as “proteomics”.