How to use neighborhood attributes in a Combo Overlay

This guide explains how to calculate the number of seniors in a neighborhood using gender totals and age percentages.

How to use neighborhood attributes in a Combo Overlay:

Select Current Situation in the ribbon bar
Hover over Overlays and under Grid Calculation, select Combo
In the Combo Overlay detail panel, select the Input tab.
Select Specific Layer for Attribute.
For Layer select Neighborhoods
Click on the Select button next to Attribute 'A' and select an attribute, for example Mannen
Click on the Select button next to Attribute 'B' and select an attribute, for example Vrouwen
Click on the Select button next to Attribute 'C' and select an attribute, for example Percentage personen 65 jaar en ouder
In the formula field, write the following formula:
```
ROUND(MULT(ADD(@A, @B), DIV(@C, 100)))
```
Click on the Update Now link and update the combo Overlay.

Notes

You can edit the formula using the 'Formula Panel' by clicking on the (enlarge) link above the Formula field.