# Order of selection boxes in a sequence

In some instances the order in which you place selection boxes in the Data selection sequence may be important

Filter boxes

▪If two or more Filter boxes refer to different variables (for example, one to filter trials, another one to filter drug doses), then the order you place the Filter boxes in does not matter.

▪If two or more Filter boxes refer to the same variable, then selection will only work if the elements selected in the second box are also selected in the first box.

example If you filter male subjects in one Filter box and female subjects in the second Filter box, the selection contains no data.

Nest boxes

The order you place the Nest boxes relative to Filter boxes does not matter.