Difference between ImpVol and HistVol (Excel File) - This spreadsheet measures the difference between ImpVol and HistVol each day and returns the 20 highest (ImpVol over Histvol) and 20 lowest (ImpVol under HistVol). It loads the data into a spreadsheet and then uses an Excel macro to re-organized the data. You can then use Excel graphing to build a histogram visual.

Dow Jones Industrial Average (Excel File) - Trading days after the Dow has weekly gains in the last four weeks and prior to that rally the Dow was down more than 20% over the prior year, since 1931.