Reduce 1 Minute Data To 30 Minutes Data In Excel

Feb 27, 2013

I have a spreadsheet that contains per minute data for the whole year. There are no gaps in data and it is complete with various values being zero. I cannot work out how to reduce the data into 30 minutes interval. I have tried to use Pivot Tables and grouping functions but it can give me daily data or hourly data but not per 30 minutes or 15 minutes of data.

What step I can follow to reduce the per minute data to 15 minute or 30 minute data.

Format of excel sheet is as below:

Date------ Time------ GSR
27/07/2010--0:00:00--1
27/07/2010--0:01:00--2
27/07/2010--0:02:00--0
27/07/2010--0:03:00--0
27/07/2010--0:04:00--1
27/07/2010--0:05:00--1
27/07/2010--0:06:00--1.5
27/07/2010--0:07:00--0
27/07/2010--0:08:00--0
27/07/2010--0:09:00--2

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