mean of each column entry

I have 2 arrays colA and colB, how can I get for example mean or other statistic of each entry of colB

I need to get something like this:

x = [-3084 -3085 -3086 -3087 etc]
y = [meanOfEachColB(-3084) meanOfEachColB(-3085) meanOfEachColB(-3086) meanOfEachColB(-3087) etc]

 colA   colB
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[phone]
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[phone]
[phone]
[phone]
[phone]
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Answer 1

[Cris LaPierre]

I'd look into grpstats. See this example.

meanA = grpstats(colA,colB,'mean')

Another option is to use groupsummary. This might be helpful because it also returns the groups.

[meanA,grpB] = groupsummary(colA,colB,'mean')

[Blazej Dobija]

[meanA,grpB] = groupsummary(colA,colB,'mean')

this work great, thanks

PS. it there any similar function for "mean 95 confidence interval"?

[Cris LaPierre]

I'm not aware of a mean function in MATLAB that also returns a confidence interval. However, you can do this manually using the mean and standard deviation of each group. Perhaps this post can help you get started.