Sometimes changes in stock prices are recorded as percentages, other times as returns. The difference is a factor of 100: Percentage changes are 100 times the returns. How does this choice affect the...

Sometimes changes in stock prices are recorded as percentages, other times as returns. The difference is a factor of 100: Percentage changes are 100 times the returns. How does this choice affect the estimated value for
 in a regression of the change in one stock on the change in the entire market? What about
 in such a regression?