FMM-internal: Internal functions for the 'FMM' package.

Description Details Value

Description

The 'FMM' package contains several internal functions called by other functions that are not designed to be called by the user.

To fit a 'FMM' model: The fitting function fitFMM() calls different internal functions for fits in different situations. fitFMM_unit() function fits a monocomponent 'FMM' model and fitFMM_back() fits a multicomponent 'FMM' model via a backfitting algorithm. refineFMM() fits a 'FMM' model from a previous object of class 'FMM'. For restricted version, fitFMM_unit_restr() is used to fit a monocomponent FMM model with fixed omega; fitFMM_restr_beta(), fitFMM_restr_omegaBeta() and fitFMM_restr() are used to fit multicomponent 'FMM' models with equality constraints for the beta and omega parameters.

To fit a single 'FMM' component: The functions step1FMM(), bestStep1() are used to find the initial parameter estimations and their optimal values in the first step of the fitting process. step2FMM() computes the residual sum of squares in the second step of 'FMM' fitting process. In the restricted version, this function is called step2FMM_restr(). In addition, stepomega() function is used in an extra optimization step of omega.

To check the convergence criterion for the backfitting algorithm: alwaysFalse() is used to force a number of iterations while R2() is used to check if the stop condition, based on the difference between the variability explained in two consecutive iterations, is reached.

Additional functions: The functions PV(), PVj() and angularmean() are used in the fitting process to compute the total percentage of variability explained, the percentage of variability explained by each component of 'FMM' model and the angular mean,respectively. seqTimes() is used to build a sequence of equally time points spaced in range [0,2*pi].

Details

These are not to be called directly by the user.

Value

Depending on the returned value:


FMM documentation built on March 2, 2021, 1:06 a.m.