Shadow1980 said:
I never did cumulative weekly data, but I have catalogued weekly data from everything. It would take forever to add hundreds of weeks worth of data, so I'll just compare raw weekly data. I decided to just align them as closely as possible while keeping the years even, so since the PS4 launched in Media Create Week 8 of 2014, I aligned that week with the PS3's Week 8 of 2007 instead aligning them by first full year, that way their first full fourth quarters are aligned. |
Those are great thanks!
As for cumulative if you're using Excel wouldn't this work?:
https://www.youtube.com/watch?v=-muM3klpNFE
I'm not sure what kind of data you have so maybe it wouldn't be so simple for you but the formula above is pretty fast to do.









