flux_fitting_quadratic function

quadratic fit to gas concentration over time

fits a quadratic model to the gas concentration over time

flux_fitting_quadratic(
  conc_df,
  conc_col,
  datetime_col,
  f_start,
  f_end,
  f_fluxid,
  start_cut,
  end_cut,
  t_zero
)

Arguments

• conc_df: dataframe of gas concentration over time
• conc_col: column with gas concentration
• datetime_col: column with datetime of each concentration measurement Note that if there are duplicated datetime in the same f_fluxid only the first row will be kept
• f_start: column with datetime when the measurement started
• f_end: column with datetime when the measurement ended
• f_fluxid: column with ID of each flux
• start_cut: time to discard at the start of the measurements (in seconds)
• end_cut: time to discard at the end of the measurements (in seconds)
• t_zero: time at which the slope should be calculated

Returns

a df with the modeled gas concentration, slope, intercept, std error, r square and p value of the quadratic model