William Blair analyst Ralph Schackart attributes yesterday's rally in shares of Quotient Technology (QUOT) to RetailMeNot (SALE) getting acquired for a 50% premium. After running a proprietary survey with more than 350 respondents to assess whether digital couponing apps were having an effect on consumers' shopping behavior, the analyst sees a higher probability that existing users will increase their digital couponing activity going forward. Increased frequency from existing shoppers could drive double-digit upside to the Street's current 2018 revenue estimate for Quotient, should the increased frequency continue, Schackart tells investors in a research note. The analyst says his valuation framework points to a share price of nearly $16. He keeps an Outperform rating on Quotient.