Calculated measures

Hi MiraAnniina 

In addition to  amitchandak ‘s reply, if you want to show result "xxx" or "yyy" based on the month column,  you just need to build one measure/ calculated column to achieve your goal.

Try if or switch function. 

Measure:

Measure = 
SWITCH(MAX('Table'[Month]),"January","xxx","February","yyy","zzz")

Calculated column:

Calculated column = 
SWITCH('Table'[Month],"January","xxx","February","yyy","zzz")

Result is as below.

Build a matrix visual and don't forget set show values in row in Format.

If you want to show result as you show above, you may need to build measures for each month.

Best Regards,

Rico Zhou

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