Secondary Activity Filter
Secondary activities occur at the same time as primary activities. Secondary activities are NOT consistently collected (see SEC). By applying secondary activity filters, only time spent during the primary activities in which one or more selected secondary activities also occurred will be aggregated to create a time use variable.
No secondary activity filter is applied unless a user specifically requests one. Therefore, given the default selection, the time spent in the specified activities (given other filter selections) is returned regardless of whether the respondent was engaged in secondary activities.