observational

US /ˌɑːb.zɚˈveɪ.ʃən.əl/
UK /ˌɑːb.zɚˈveɪ.ʃən.əl/
1.

quan sát

involving watching someone or something carefully and closely, in order to learn something:

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Observational research uses data collected during routine clinical care.
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observationobserverobserveobservation car