The phrase "as an observer when" is correct and usable in written English.
It can be used to introduce a perspective or context in which someone is observing a situation or event.
Example: "As an observer when the debate took place, I noticed several key arguments that were overlooked."
Alternatives: "from the viewpoint of an observer" or "in the role of an observer".
Mitchell was already in Europe as an observer when the United States entered World War I.
I feel more legitimate as an observer when I am in that place so I seek it out.
I can believe in the possibility of a world without me, even though I smuggle myself in as an observer when I picture that world without me.
I can believe in the existence of a meeting that takes place, even though I smuggle myself in as an observer when I picture that meeting.
Each examiner also acted as an observer when the examination was conducted at their own institution.
9 Findings from studies of simulated telephone referrals made by medical students and junior doctors have shown improved communication 14 and improved call impact as measured by an observer when SBAR was used.
Chester B. DePratter, an archaeologist at the University of South Carolina who is an authority on Spanish exploration in the Southeastern United States, happened to be at the Joara site as an independent observer when the discovery was made.
Have them do the task (even as an observer, my heart races when the simulator "patient" goes into cardiac arrest), and then debrief afterwards with the whole class.
As someone who was in the room as an observer at the Groupon board when the decision to use these metrics was made, I think Groupon was honestly trying to provide additional information that investors would find useful, which mirrored the way management thought about running the business.
Field data in which no birds are detected by either observer when acting as the secondary observer, but many birds are detected by primary observers, would indicate a high detection probability where the proposed bootstrap approach could be applied.
When I went as an observer to the Republican National Convention in Cleveland, I was astonished by the reaction.
