select_daily_reference_data

Usage

select_daily_reference_data(standard_df, analyte, min_nobs = NA)

Arguments

standard_df: Input reference data.frame.
analyte: Are we calibrating CO2 and H2O? (Use argument 'co2' or 'h2o', or else function will throw error)
min_nobs: Minimum number of high-frequency observations to define a peak. If not supplied, defaults are 200 for analyte = 'co2' or 30 for analyte = 'h2o'

Value

Smaller data.frame where only the reference data selected to use in the calibration routines is returned. Assumes that we are calibrating on a daily basis, and not on a longer time scale. Data are selected based on two criteria: cannot be missing, and must be at least a certain number of high-frequency observations in order to qualify as a valid measurement. For the water system, this function also keeps only the last three injections for each reference water per day.