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Average of rows based on oter column

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YEMY
YEMY 2022-6-23
回答： Image Analyst 2022-6-23
Hello,
I have a very big dataframe with many columns, I am interested in making the average of a variable X only between 8am and 7pm (the hours column is introduced in the dataframe and expressed in military time (8am = 0800 or 800) and I have records every 30 minutes.
As an addition and if it is possible, I want to know the count of how many rows have been used to make the average for each day, as I have missing data and not all the 30 minutes observations are present.
Thank you.

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Image Analyst
Image Analyst 2022-6-23
Try grpstats, groupsummary, or splitapply. You might also want to take a look at findgroups

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