This function is used to preprocess data via normalization. It provides three normalization methods: standard normalization, quantile normalization and median fold normalization. The median fold normalization is adapted from http://www.metabolomics-forum.com/index.php?topic=281.0.
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An expression data frame with samples in the rows, metabolites in the columns
The method to be used to process data, including standard normalization (standard), quantile normalization (quantile) and median fold normalization (median).
A normalized dataset with samples in the rows, metabolites in the columns.
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