When working with tables, you can easily enable Total values for rows and columns.
This is easily enabled by using two buttons in the interface above the crosstab.
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Click on 'Totals: Columns' or 'Totals: Rows' in the crosstab toolbar to switch them on.
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Click again to switch them off.
If you don't see 'Totals: Columns / Row' on the screen:
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go to the Project Settings → Settings → Totals;
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tick check-boxes next to both Columns and Rows.