So are you looking to group the day into "day parts" of the same size each day, so say call them morning lunch afternoon and evening, and then grouping tests by what group they fall in? or more of the given 3-4 tests as points throughout the day put curved lines between the points so you can "guess" what the glucose reading was at some point between your tests? I would go with the daypart methode, only because whatever you do to try and guess what the reading would have been at a given point I would suspect it will be wrong, because of factors like when/what you ate.
daN.