Calculate normalization parameters for the data via median centering.
median_center(
e_data,
edata_id,
subset_fn,
feature_subset,
backtransform = FALSE,
apply_norm = FALSE,
check.names = NULL
)a \(p \times n + 1\) data.frame, where \(p\) is the number of peptides, lipids, or metabolites and \(n\) is the number of samples. Each row corresponds to data for a peptide, protein, lipid, or metabolite, with one column giving the biomolecule identifier name.
character string indicating the name of the peptide, protein,
lipid, or metabolite identifier. Usually obtained by calling
attr(omicsData, "cnames")$edata_cname.
character string indicating the subset function to use for normalization.
character vector containing the feature names in the subset to be used for normalization
logical argument. If TRUE, the data will be back transformed after normalization so that the values are on a scale similar to their raw values. See details for more information. Defaults to FALSE.
logical argument. If TRUE, the normalization will be applied to the data. Defaults to FALSE.
deprecated
List containing two elements: norm_params is list with two
elements:
| scale | NULL |
| location | numeric vector of length n medians for each sample |
backtransform_params is a list with two elements:
| scale | NULL |
| location | numeric value giving global median across all samples |
If backtransform is set to TRUE then each list item under
backtransform_params will be NULL.
If apply_norm is TRUE, the transformed data is returned as a third
list item.
The sample-wise median of the feature subset specified for normalization is subtracted from each feature in e_data to get the normalized data. The location estimates are the sample-wise medians of the subset data. There are no scale estimates for median centering, though the function returns a NULL list element as a placeholder for a scale estimate. If backtransform is TRUE, the global median of the subset data (across all samples) is added back to the normalized values. Medians are taken ignoring any NA values.