[stagpanther]

It's not "real time" as in when you are shooting, as the data and the Labradar's stat calculations are coming off the memory card after the shooting session is done. What he means is that, rather than being stuck with the stats the Labradar recorded on the card, he set Excel up to calculate the same stats directly from the velocity data, so that if you alter a piece of data the whole sheet recalculates the stats on the fly (Excel's normal mode of operation, though you can also force a recalculation any time with the F9 key). This allows him to identify erroneous data and eliminate it and get automatically updated stats that are correct for the remaining data only, and that no longer include the error.

Got it--I used to program database-driven websites so I understand the linking of mathematical formulas as data checks and populators of cells.