Thanks for your insight kwancy. I guess my question I was trying to answer was: how does a stock price fluctuate during periods inbetween earnings reports? Sure, maybe a company releases a positive earnings report one quarter, but after the hype is over, the stock price often drops as sharply as it went up. I think the answer I've found from some various articles online is that there is no set in stone answer ... it's supply and demand. That's why I believe that technical analysis, more specifically, trends in stock price and other indicators, is a better ... indicator of future stock price.
It all depends on someone's goals though. I do believe that for long-term investors, they're better off keeping a consistent record of past earnings, present earnings, and future earnings projections.