I have a data set which includes

**weekly/monthly sales**and questions about

**customer satisfaction**. I have already done EFA/CFA based on these satisfaction questions (turns out it's just one satisfaction factor)

I would like to

**regress sales on satisfaction**, but I think I should include a

**time component**(based on literature review, i.e. past satisfaction affects future satisfaction and same with financial data)

Which Time Series Model should I use?

Btw. I am a complete newbie in time series, now reading "Time Series Analysis and Its Applications With R Examples" by Shumway and Stoffer, hopefully getting some answers there.

Thanks in advance