Sum up congener sample concentrations to create a composite parameter value. Primarily intended as a helper function in fuse_samples.
cen_sum(qual, result, nd = c("A character vector containing non-detect indicator strings, e.g., "<" or "ND". The strings used to indicate censored status can be edited in the "nd" argument.
A numeric vector of concentration measurements.
A list indicating all the censoring flags included in the dataset. Defaults to "<", "nd", and "ND".
dataframe with two columns, qual (character) and result (numeric)