Standard deviation of aggregate data

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Abraham
Abraham 2013-7-8
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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回答（1 个）

Shashank Prasanna
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:
http://www.mathworks.com/help/stats/grpstats.html

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