Simply what the title is asking. Cbioportal allows for either Log2 cna values or linear cna values. Is this simply how the values were normalized? Is there a way to differentiate between the two value types by seeing the numbers?
Give us a link to the cBioPortal dataset you're seeing and try browsing for information on the dataset being used - look for mentions of tools used to get to the datasets being exposed for use/visualized.
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