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Hello, all--I have a large collection of water quality data collected every 30 minutes from 1999 to 2006. I have attached a truncated version of one of my tables so you can see what I am working with. I need to conduct some calculations on these "DO_pct" and "DO_mgl" data at overlapping...

Hello, Smart Folks--I have a database consisting of water levels (tidal heights) collected every 30 minutes for a year at one station, every six minutes at another. There are two high tides on most days, and two low tides on most days; one high tide is higher than the other ("HH" for "higher...