“Zainstaluj arch.univariate import arch_model” Kod odpowiedzi

Zainstaluj arch.univariate import arch_model

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NameError                                 Traceback (most recent call last)
~\AppData\Local\Temp/ipykernel_7884/3876866814.py in <module>
----> 1 adf = ADF(default, trend="ct", lags=5)
      2 print(adf.summary().as_text())

NameError: name 'ADF' is not defined