RPM Scaling

The RPM (Reads Per Million) Scaling process is a straightforward normalization method for Count data. It divides the raw read count by the total number of mapped reads, and multiplies the result by 1,000,000.

For additional details, please refer to Motameny et al. (Genes 2010).

What do I need?

Two data sets are required by this process:

•	A SAS Input Data Set containing count data. The sam_mus_gse18905_chr1_6s.sas7bdat data set serves as an example, and is shown below. This is a tall data set, with 12 columns and 3,421 rows.

•

An Experimental Design Data Set (EDDS) . This data set tells how the experiment was performed, providing information about the columns in the input data set. Note that one column in the EDDS must be named ColumnName and the values contained in this column must exactly match the column names in the input data set. The edf_mus_gse18905_chr1_6s.sas7bdat data set serves as an example, and is shown below.

Note : The EDF for this process requires an additional TotalNumberofReads column. This column, which specifies the number of reads, is normally generated during data import by the SAM Input Engine , BAM Input Engine , or Eland Input Engine .

The sam_mus_gse18905_ch1_6s.sas7bdat and edf_mus_gse18905_chr1_6s.sas7bdat data sets were downloaded from GEO .

For detailed information about the files and data sets used or created by JMP Life Sciences software, see Files and Data Sets .

Output/Results

Refer to the RPM Scaling output documentation for detailed descriptions of the output of this process.