If the concentrations or times are invalid, will provide an error. Reasons for being invalid are
time is not a number
conc is not a number
time value is NA
time is not monotonically increasing
time are not the same length
Time of the measurement of the concentrations
Must the time be unique and monotonically increasing?
Some cases may generate warnings but allow the data to proceed.
A negative concentration is often but not always an error; it will generate a warning.
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