Hi, would like to know how to calculate the chart gapping. Every quarter, when company release earnings, be it gap up or down. For example, AAPL releasing earnings on 23rd Jan 2008 after the close, on the 22nd Jan 2008, AAPL was trading at $123 and after the earning release, it gap up to $156. If calculate manually on the chart, it's a $33 gap up. - How can I calculate this automatically? I mean like any software or what.....that can help me make my life easier.
You could download the historical prices from Yahoo (Excel format) and do the calculations in Excel. http://finance.yahoo.com/q/hp?s=AAPL