| Lusche said: I don't think thats how YOY calculation works ... yes it sold more units in 2014/week, but YOY its down ... blame the YOY calculation and not the user ... |
YOY works based on "first day of period to last day of period". In this case, for January, that's 1st of January to 31st of January. Or, if we're talking YTD, this would be up to 1st of February (last day we have data for).
Using NPD data doesn't work, especially in this case, because NPD data from 2013 was 5 weeks, due to the "leap year" effect - they track 52 weeks, while a year is 52 weeks and 1 or 2 days (depending on whether it's a regular leap year), and so every five or six years, there has to be an extra week in one of the "months". Anybody who would base the YOY calculation on inconsistent "Year on Year" periods is either ignorant or intentionally misrepresenting things.
