I have 1 minute trade data for a particular stock and was wondering how I can compare the volatility of a particular period (08:00 - 09:00 for example) between days. I have data for 100 days and want to sort the days by most to least volatile.
My initial idea was to take the logarithm of each data point (close - open) and then just take the standard deviation of each day and sort by the outcome. This was after reading the following: "volatility is the standard deviation of the instrument's logarithmic returns". Seems a bit sketchy or maybe I am on the right track?