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Old 10-21-2009, 05:08 AM   #1
Junior Member
Location: USA

Join Date: May 2009
Posts: 3
Default RPKM as calculated by TopHat

Does anyone have any experience with the RPKM (reads per kilobase of exon per million mapped reads) as calculated by TopHat? I can't find any documentation on how this is calculated, and I'm trying to make sure that it standardizes for the total number of mapped reads (as suggested by the name of the metric). I would like to compare RPKM values between samples which have different numbers of total reads and mapped reads, and I'm wondering if I need to do my own standardization for the total number of mapped reads or if this is unnecessary because TopHat has already corrected for it.
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