Exact(30)
In particular, the procedure is a linear transformation that maps each array's PM intensity distribution, Ij, onto the average PM distribution of all arrays, Iref.
Expression summaries were calculated based on the normalized PM intensity values.
The probe (PM) intensity distribution was evaluated using hist function (Bioconductor package affy).
The value for each probe pair was calculated by subtracting the mismatch (MM) intensity from the perfect match (PM) intensity.
The presence of hybridization/construction artifacts was evaluated with the fitPLM function (Bioconductor package affyPLM), and the probe (PM) intensity distribution was evaluated using hist function.
The Global background compensation is a simple method to minimize the array-wise background level by subtracting the array PM intensity minimum from all PM values, i.e. resetting each array intensity distribution to start at zero prior to normalization.
Similar(30)
Further work has analysed differences in PM and MM probe intensities, and some background adjustment algorithms such as RMA or GCRMA have been developed for using PM intensities only, hence omitting problems associated with MM probes [ 19].
The.CEL files were exported and raw PM intensities were extracted for the 20 arrays.
We found that MM intensities exceeded PM intensities less frequently when we used sscDNA as compared to cRNA.
Some of these use the MM intensities as corrections for non-specific hybridization, while others rely on PM intensities only.
Raw PM intensities from each array were subjected to local background correction using MAS5 method, log2-transformed and median-centered.
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