What day of the week will be the next >=10% change in the S&P 500?
1
11
145
2028
34%
Monday
17%
Tuesday
17%
Wednesday
17%
Thursday
17%
Friday

i.e. if it ended on say, tuesday at 1000. And then at end of day weds it is 1100 or higher, or 900 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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