center_normalise_to_ref | R Documentation |
Center-median normalisation is a simple normalisation method
that is appropriate for relative abundance proteomics such as isobaric tagging.
This can be achieved with MSnbase::normalise(method='diff.median')
. However,
for some experimental designs, the normalisation should be against the medians
in another dataset. For example, for PTM studies, one may wish to isobaric
tag samples, pool, and then PTM-enriched, with the enriched sample quantified
in a separate run to the non-enriched (total) sample. In this case, it may make
more sense to center-median normalise the PTM-enriched samples using the median
from the total samaples.
center_normalise_to_ref(
obj,
medians,
center_to_zero = FALSE,
on_log_scale = FALSE
)
obj |
|
medians |
|
center_to_zero |
|
on_log_scale |
|
Returns an MSnSet
with the expression matrix column center-median
normalised
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