BackgroundValues        Improved background values
CombinedModels          Combined models
ConfidenceInterval      Confidence interval of predicted values
ExtendedForms           Extended forms of grey models
IntervalMultivariable   Multivariate interval sequences
Multivariable           Multivariate sequences
Optimization            Optimization-based grey models
ParametersEstimation    Parameters estimation
ResidualModification    Residual modification
plots                   plots
ui                      Runs the Shiny app
