readHFDweb(). We assume there are no factors in the given data.frame and that it has been read in from the raw text files using something like:
read.table(file = filepath, header = TRUE, skip = 2, na.strings = ".", as.is = TRUE). This function is visible to users, but is not likely needed directly.
a data.frame of HFD data, freshly read in.
This parse routine is based on the subjective opinions of the author...
DF same data.frame, modified so that columns are of a useful class. If there were open age categories, such as
"+", this information is stored in a new dummy column called
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