a non linear model combining an exponential and a linear fit is applied to the data using the Gauss-Newton algorithm of nls. starting values are calculated based on the data. Weights are applied to the model based on the estimated insecurity of the data quality.
ApplyCombMod(data, y = "y", x = "x")
data frame containg x and y data to which the model is ought to be applied to
name of column in data containing y data
name of column in data containing x data
model parameters