For many investors, that's not been a convincing argument. The lender's stock has fallen more than one-third since early January. But analysts expect the shares to rebound. Investors trying to decide whether the recent selloff is a red flag or a buying opportunity need to pick through the numbers carefully. It's complicated, but just you wait. That's the message from Capital One NYSE: COF in light of its first-quarter results as it undertakes a significant rejiggering of its business. Get Capital One Financ ...