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Basic Question 0 of 17

If linear regression is used to model the relationship between two time series, and a test shows that one of the two time series has a unit root, we should:

A. not use linear regression.
B. safely use linear regression if the time series are co-integrated.
C. not use linear regression if the time series are not co-integrated.

User Contributed Comments 1

User Comment
wtwaf key words: one of the two

good question!
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Colin Sampaleanu

Colin Sampaleanu

Learning Outcome Statements

explain how time-series variables should be analyzed for nonstationarity and/or cointegration before use in a linear regression;

determine an appropriate time-series model to analyze a given investment problem and justify that choice.

CFA® 2025 Level II Curriculum, Volume 1, Module 5.