Ko ngā raraunga ka hua ake i te ine i tētahi āhuatanga i te takanga o te wā. Ka whakaatu ēnei momo raraunga i te rerekē haere o taua āhuatanga i te takanga o te wā. Hei tauira, ko te ine i te tāroaroa me te taumaha o tētahi pēpi i ia wiki.
Data which arises from measuring something over a period of time. This type of data shows how something changes over time. For example, the length and weight of a baby which is measured every week.