What data for creating weekly MP numbers?

I am looking for MP related levels to add to my entry system. I have a few questions though. I guess I am just looking for a consensus if one can be agreed upon.

If I was to calculate weekly MP levels, do I want just the high and low for the week, or would I take the high and low for the last 5 days of data individually?

The midpoint seems to come out the same - but the VAH and the VAL are as much as 20+ points different.
 
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