Initial (minimal functionality) SETAR model
Added standard errors to test cases
Placed additional (still minimal) restrictions on delay parameter.
Created more values in initialization to save re-calculations (made possible by additional restrictions on delay parameter)
Refactored all SETAR-dataset building functionality into its own function, also improved speed.
Cleanup
Implemented hyper parameter grid search selection
Moved grid size and max iterations to parameters.
Added support for specified delay with unspecified thresholds.
General improvements and added unit tests for delay and threshold search.
Extend delay grid to include delay of 1.
_select_hyperparameters_grid returns more sensible values
Added threshold critical values as (static) class property
Added sunspots example
pep8 fixes
Refactored to use multiple inheritance approach; improved consistency with parent models.
Improved docstrings.
Add SETARResults class, with summary method, confidence interval plots.
Replaced build_datasets with build_exog
Made date handling in summary more robust.