An analyst has data for the quarterly revenue of a company from the first quarter of 2015 to the third quarter of 2020. He has been asked to run a regression analysis to predict the revenue of the company in the fourth quarter of 2020. To do this, he creates a time trend and a dummy variable for each quarter. However, his boss also gave him the stock price of the company for the 1st day of the month from 1st September 2016 to 1st February 2021. Can the analyst add the stock price to the regression's list of explanatory variables?

a) No because revenue covers a three-month period and stock prices are at a single moment in time. b) No because stock prices start in 2016 and revenue starts in 2015. c) Yes you can d) No because stock prices don't line up with the revenue figures. For example, we have a stock price for 5/1/2018 but revenue figures for 5/4/2018. e) No because conceptually this says people's decision to buy computers is based on how Dell's share price is doing in the stock market.