What day of the week will be the next >=5% change in the S&P 500?
2
16
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2028
23%
Monday
20%
Tuesday
18%
Wednesday
20%
Thursday
20%
Friday

i.e. if it ended on say, tuesday at 1000. And then at end of day weds it is 1050 or higher, or 950 or lower, then the answer is WEDNESDAY.

We take (end of prior day) => (end of day in question) as the change, so that we treat "overnight changes" as being part of the subsequent day.

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