Updates across the board, including:
spp_test().skpss_test() performs the KPSS test with simulated
critical values.sim_ts() is a function for simulating time series,
mostly used internally.sim_df_mod() is a function for simulating Dickey-Fuller
statistics, mostly used internally.sadf_test() does the (Augmented) Dickey-Fuller test
with simulated critical values.adf_lag_select() helps the user identify potentially
optimal lag selection for (Augmented) Dickey-Fuller tests.ur_summary() provides a more straightforward function
to summarize unit root tests produced in this package.USDICE, tbills, exCopdab,
lag_suggests, and money_demand are toy data
sets now included in this package.Initial development offering.