Shares of Groupon (GRPN) have gained 12.5% over the past four weeks to close the last trading session at 12.87,buttherecouldstillbeasolidupsideleftinthestockifshort−termpricetargetsofWallStreetanalystsareanyindication.Goingbythepricetargets,themeanestimateof16.88 indicates a potential upside of 31.2%.The mean estimate comprises four short-term price targets with a standard deviation of 7.94.Whilethelowestestimateof7.50 indicates a 41.7% decline from the current pri ...