You might be better off to pre-calculate this using Goals (use open-ended dates and do the date filtering in the goal rollups). Failing that, you could probably do this with two link-entity clauses with different filters to fetch the two aggregate fields. If you want to group one series by created on week, and the other by status change week, you will probably need two x-axes, although you could then hide one of them. I have to ask: why 26 days? Why not 28? Or why not use "Last X weeks" with X=4, instead of days?
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