Calculates Root Mean Squared Error (RMSE) for estimates on a single site
mpspline_rmse1(s = NULL, p = NULL, var_name = NULL)length-2 named numeric - RMSE and RMSE scaled against input data's interquartile range.
data.frame; data for one site
list; estimated spline parameters for one site from
mpspline_est1
character or integer vector denoting the column(s) in
site in which target data is stored. If not supplied, the fourth
column of the input object is assumed to contain the target data.