This function applies the qrollup method to a pepData object for each unique protein and returns a proData object.
qrollup(pepData, qrollup_thresh, combine_fn, parallel = TRUE)an omicsData object of class 'pepData'
numeric value between 0 and 1 inclusive. Peptides above this threshold are used to roll up to the protein level
logical indicating what combine_fn to use, defaults to median, other option is mean
logical indicating whether or not to use "doParallel" loop in applying qrollup function. Defaults to TRUE.
an omicsData object of class 'proData'
In the qrollup method, peptides are selected according to a user selected abundance cutoff value (qrollup_thresh), and protein abundance is set as the mean of these selected peptides.
Polpitiya, A. D., Qian, W.-J., Jaitly, N., Petyuk, V. A., Adkins, J. N., Camp, D. G., ... Smith, R. D. (2008). DAnTE: a statistical tool for quantitative analysis of -omics data. Bioinformatics (Oxford, England), 24(13), 1556-1558.