truncate to 1 before log2 transform while loading data?

[Xin Lu]

Hi Cheng

I'm using dChip to analyze a data set, while loading external data, I checked the option of log 2 transformation.  Seems dChip did a truncation of the values to 1 before taking log, as all the values between 0 and 1 now become 0.  Actually most of the values in my dataset are between 0 and 1, is there a place that I can tell the software to not truncating the low values or truncate to a lower value, say 0.001?

Thanks

[Cheng Li]

Xin,

The option is for raw expression values and therefore not application to values < 1. You may transform the data in R or Excel before importing into dChip.

Cheng
http://www.ChengLiLab.org/

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