I need a formula to convert 15 minute timestep data to hourly average (an
average of the four 15 minute data points for the hour).

My spreadsheet looks like this:
datetime in first cell data in second cell
1/1/00 00:00 2.2
1/1/00 00:15 2.0
1/1/00 00:30 1.9
1/1/00 00:45 2.0
1/1/00 01:00 2.4
1/1/00 01:15 2.2
1/1/00 01:30 2.1
1/1/00 01:45 2.0
1/1/00 02:00 1.8

etc..... I have about hundreds of rows of this type of data. At times there
may be missing data, but the correct time is there, there is just no data in
the cell. I would like a third column of data that would have the date/time
at the top of the hour and the fourth column to have the hourly average.

Any help appreciated.

To convert 15-minute timestep data to hourly average, follow these steps:

1. Insert a new column next to the data column. In this new column, enter the formula to round the datetime to the nearest hour. For example, if your datetime is in cell A2, enter the formula
   Code:

   "=ROUND(A2*24,0)/24"

   in the new column B2. This will give you the datetime at the top of the hour.
2. In the fourth column, enter the formula to calculate the hourly average. For example, if your data is in column C and your datetime rounded to the nearest hour is in column B, enter the formula
   Code:

   "=AVERAGEIF(B:B, B2, C:C)"

   in the fourth column D2. This will give you the average of the four 15-minute data points for the hour.
3. Copy the formulas in columns B and D down to all the rows of data.
4. If there is missing data, the AVERAGEIF function will ignore the empty cells and only calculate the average of the available data points.

That's it! You now have a third column with the datetime at the top of the hour and a fourth column with the hourly average.

Hi,
The following seems to work even if there is missing data.
Assuming your data starts in row 2, enter the following formula in C2 and
drag down

=IF(MOD(ROW()+2,4)=0,VLOOKUP(ROUNDDOWN(A2*24,0)/24,$A$2:$B$10,2),"")

and the following formula in D2 and drag down

=IF(MOD(ROW()+2,4)=0,AVERAGE(B2:B5),"")

Dave

url:http://www.ureader.com/msg/10356248.aspx

Hi again,
Correction to previous reply. To get the time in Column C,
put the following into C2 and drag down.

=IF(MOD(ROW()+2,4)=0,ROUNDDOWN(A2*24,0)/24,"")

Dave

url:http://www.ureader.com/msg/10356248.aspx

Thanks for your help, it works!

"Dave Curtis" wrote:

Hi again,
Correction to previous reply. To get the time in Column C,
put the following into C2 and drag down.

=IF(MOD(ROW()+2,4)=0,ROUNDDOWN(A2*24,0)/24,"")

Dave

url:http://www.ureader.com/msg/10356248.aspx

Hi,
I tried to use this and it works but how can I get the B2:B5 range to begin
at the ending cell (i.e. B5) and calculate each subsequent range accordingly.
My problem is that if I am averaging every 15 minute data for each hour I
would like for it to calculate B2:B5, B5:B8, B8:B11,etc...Any help would be
much appreciated. Thank you for taking the time to look at this.

url:http://www.ureader.com/msg/10356248.aspx

Hi
I have the same thing. I have to average at 10 minutes interval. But i also have garbage values like 999. Will it work for that as well?

Regards



On Tuesday, August 12, 2008 at 2:24:07 AM UTC+2, Emily wrote:
I need a formula to convert 15 minute timestep data to hourly average (an
average of the four 15 minute data points for the hour).

My spreadsheet looks like this:
datetime in first cell data in second cell
1/1/00 00:00 2.2
1/1/00 00:15 2.0
1/1/00 00:30 1.9
1/1/00 00:45 2.0
1/1/00 01:00 2.4
1/1/00 01:15 2.2
1/1/00 01:30 2.1
1/1/00 01:45 2.0
1/1/00 02:00 1.8

etc..... I have about hundreds of rows of this type of data. At times there
may be missing data, but the correct time is there, there is just no data in
the cell. I would like a third column of data that would have the date/time
at the top of the hour and the fourth column to have the hourly average.

Any help appreciated.

Hi
I have a data in the following format

datetime Value
1/1/2012 0:00 10.78
1/1/2012 0:10 11.95
1/1/2012 0:20 12.91
1/1/2012 0:30 12.98
1/1/2012 0:40 12.53
1/1/2012 0:50 12.97
1/1/2012 1:00 12.41
1/1/2012 1:10 11.85
1/1/2012 1:20 12.2
1/1/2012 1:30 12.36
1/1/2012 1:40 12.52
1/1/2012 1:50 12.61
1/1/2012 2:00 12.81

I want the result like
datetime Value
1/1/2012 0:00 Mean value of 6 values
1/1/2012 1:00 Mean value of hour

Also there r some NaN values like 999 and i want it to be ignored.

I would be very thankful for your help. Thanks

Regards














On Tuesday, August 12, 2008 at 10:02:57 AM UTC+2, Dave Curtis wrote:
Hi,
The following seems to work even if there is missing data.
Assuming your data starts in row 2, enter the following formula in C2 and











drag down

=IF(MOD(ROW()+2,4)=0,VLOOKUP(ROUNDDOWN(A2*24,0)/24,$A$2:$B$10,2),"")

and the following formula in D2 and drag down

=IF(MOD(ROW()+2,4)=0,AVERAGE(B2:B5),"")

Dave

url:http://www.ureader.com/msg/10356248.aspx

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