Average of rows based on oter column
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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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