Rolling Maximum Sum Over a finite Period
Hi, I have a dataset of about 500,000 rows, each date stamped by the minute. I am trying to find the maximum sum over a 15 minute, 1 hours and 4 hour period i.e. Row 1-15 sum = e.g. 5000 (5000 would be the sum of rows 1-15)Row 2-16Rows 3-17 sum = e.g. 8000 (8000 would be the sum of rows 3-17)... Rows 10-25 sum = e.g. 7900 (7900 would be the sum of rows 10-25) I would like the tabulation to return ...