How I calculate the MAT in the Previous Year

[christopher2211]

Hello,

I have a problema with Previous Year MAT/SEM

I have this Date Data.

The idea in QlikSense is that I selected the Period Type, and then the YearMonth, a show the Data of MAT 2018-03 vs MAT 2017-03 ;

or If I selected SEM 2018-03 show me SEM 2018-03 vs SEM 2017-03, How I do it?

Mi Data Value have this structure in Period.

Thank in advance.