Remove `k_endog` & `k_exog` parameters in SSM#599

Merged

jessegrabowski merged 10 commits intopymc-devs:mainfrom

Dekermanjian:remove_kendog_kexog_ssm

Nov 2, 2025

Commits on Oct 29, 2025

removed k_endog argument from BayesianETS making endog_names required and updated tests accordingly
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removed k_exog from SARIMAX preferring exog_state_names for defining exogenous variables and updated tests accordingly
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Updated VARMAX model by removing k_endog & k_exog arguments making endog_names required and exog_state_names required for exogenous variables and updated tests accordingly
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updated DFM by removing k_endog & k_exog args and made endog_names required and exog_names required if exogenous variables are requested and updated tests accordingly
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removed k_exog from STS regression component and updated tests accordingly
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updated docstrings of VARMAX and DFM to relect changes in removal of k_endog and k_exog parameters
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moved endog_names validation into stand alone utility
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removed commented code and tests, updated validate names test to be reused in both endog and some exog cases
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Commits on Nov 1, 2025

updated docstring in regression component
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Commits on Nov 2, 2025

updated validate_names to always return None, removed _handle_input_data, reverted test_SARIMA_with_exogenous to use stationary initialization
Dekermanjian
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