R help - Feb 2007 - is a time series regression model a causal forecasting model?

I have a semantics question, I am reading Bowerman and O'Connell and they
state that forecasting models fall into two categories, univariate and
causal. My question is whether a time series regression model that relates
the time series of interest to functions of time such as the day of the week
or month of the year could be considered a causal model?

thanks,

spencer

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