Exact(60)
"The reason is, the sample is too small".
The next concern is the sample size: just 100 incidents in all, according to Aviva, and so a mere 33 where no lights were supposedly involved.
N is the sample period.
l is the sample index.
Ts is the sample interval.
where is the sample mean,.
where is the sample weight.
Here, νR is the sample spinning frequency.
The red point is the sample value.
t is the sample time (local time).
where n is the sample size.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com