Standard deviation of aggregate data
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Hi
I have two matrix with 1) day 2) travel time (sec). Where there are several observations of travel times per day. And date for more than two years.
day .......Traveltime
1 .............220
1 .............230
1 .............240
2 .............210
2 .............210
...etc
How can I aggregate the data_, so that I will have only one observation (average travel time) per day, and the standard deviation for each day.
So that the output, will be something like this:
day.......average_time.......Std_dev
1............230.............10
2............210.............0
I would appreciate if you can help me.
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Shashank Prasanna
am 8 Jul. 2013
Group stats can be used to compute statistics based on some grouping. In this case day is the grouping variable and mean and standard deviation are your statistics.
Take a look at few examples that demonstrate how to do this:
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