sineFit: Cosine model fitting
In kserkcho/SCEM: Splitting-Coalescence-Estimation Method

Description Usage Arguments Value References Examples

This function performs the updated nonlinear least squares (NLS) regression method for the cosine model (see Chazin et al. 2019).

1	sineFit(data, amplitude = NULL, intercept = NULL, method = c("OLS", "initial"))

`data`	A data frame that contains the data for one individual. There should be two columns with names 'distance' and 'oxygen'.
`amplitude`	Initial value for the amplitude parameter for the `method="initial"` method.
`intercept`	Initial value for the intercept parameter for the `method="initial"` method.
`method`	A character string giving the initialization for the nonlinear least squares regression. This must be either `method="initial"` or `method="OLS"`. Default is `method="OLS"` method. `method="initial"` performs the nonlinear least squares (NLS) regression method for the cosine model without initializing parameter selections. It begins with the given initial values for amplitude and intercept. `method="OLS"` uses the least squares estimates (see Chazin et al. 2019) as the initial parameter selection.

A fitted model object from the nls function in R:

`m`	an 'nlsModel' object incorporating the model.
`convInfo`	a list with convergence information
`data`	the expression that was passed to 'nls' as the data argument. The actual data values are present in the environment of the 'm' component.
`call`	the matched call with several components, notably 'algorithm'
`dataClasses`	the '"dataClasses"' attribute (if any) of the '"terms"' attribute of the model frame.
`control`	the control 'list' used

Florent Baty, Christian Ritz, Sandrine Charles, Martin Brutsche, Jean-Pierre Flandrois, Marie-Laure Delignette-Muller (2015). A Toolbox for Nonlinear Regression in R: The Package nlstools. Journal of Statistical Software, 66(5), 1-21. URL http://www.jstatsoft.org/v66/i05/.

armenia_split = split(armenia,f = armenia$ID)
amp = seq(1,10,by=0.5)
int = seq(-25,0,by=0.5)
sineFit(armenia_split[[2]],amp[3],int[4],method = "initial")
sineFit(armenia_split[[1]],method = "OLS")