topic Re: Log2 transformation in Discussions

Log2 transformation

TRR21 — Fri, 04 Nov 2016 22:03:41 GMT

Hi I have a list of protein measurements that have a wide spread (usually on the higher end)- inorder to compress the dynamic range to look at correlations with other parameters, I want to convert it to a log2 scale (primarily to be consistent with how someone else had analyzed it). I see natural log and log10 options in the formula transfrorm but none for log2. If I try to manually edit the formula from log[x] to log2[x], it throws an error. Any ideas to be able to do this? Thanks.

Re: Log2 transformation

KarenC — Sat, 05 Nov 2016 20:55:07 GMT

The formula is: Log(:Column, 2)

In the formula editor if you select "Log" then you see one spot for the column name. After you enter the column click on the ^ (in the top bar of formula editor) and a subscript "10" will magically appear, you can then click on the 10 to replace it with a 2.

Re: Log2 transformation

TRR21 — Mon, 07 Nov 2016 15:26:50 GMT

Thank you. That worked!

Re: Log2 transformation

txnelson — Mon, 07 Nov 2016 17:31:59 GMT

TRR21,
Please mark this discussion as "Solved". It really helps other users when looking for answeres

Re: Log2 transformation

txnelson — Mon, 07 Nov 2016 19:39:11 GMT

TRR21,

I am getting a bit picky here, but you marked your response indicating "Thank You" as the solution. Karen's answer is what needs to be marked as the solution, so the users can go directly to the solution, and so that Karen gets credit for the solution.

Re: Log2 transformation

Jeff_Perkinson — Mon, 07 Nov 2016 19:43:44 GMT

I corrected it. @KarenC's reply is now the Accepted Solution.