Annual yield is certainly a number to keep in your research bucket because it can be a great way to compare companies within the same industry, giving you an apple to apple result. Also, this is going to tap into many of the fundamental numbers that can really tell you the true health of the company. Overall, this tool is reliable and can give you great insight. If you still have questions, reach out to your investing community and get their opinions on whether or not you are using it correctly or in an effective manner.