You might want to play around with measures, and ensure your "play area" has the same slicer setup as your page does.
00:00 Intro
00:27 Data model
01:16 Crossjoin-method (easier)
02:39 CalculateTable (WRONG)
03:06 Proper CalculateTable
04:32 Summarize-method (harder)
06:34 Teaser for video 56