flux_regression: Estimate daily loads using multi-variate regression
In walkerjeffd/fluxr: Estimate water quality loads using the FLUX algorithms

Estimate daily loads using multi-variate regression

1 2	flux_regression(x, interp = FALSE, max_interval = 90, extrapolate_flow = FALSE, start_month = 10, predict_wyear_range = NULL)

`x`	data frame containing observed concentrations, flows, and loads
`interp`	flag to interpolate residuals
`max_interval`	maximum interval for using interpolation
`extrapolate_flow`	flag to allow extrapolation of flow variables for prediction (Qderiv, Q)
`start_month`	first month of water year
`predict_wyear_range`	vector of length 2 specifying range of water years for final predications (or NULL to use span of data)