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.