Errorbars with standard deviation

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Michael Molini 2019-7-3

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评论： Peter Perkins 2019-7-8

How do I graph average bedtime in hours with a standard deviation error bar? I want the y axis to reflect times from 8pm to 6am. Also not sure how to scale x axis. The average bedtime was 1:37am and the std was 2.07.

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Adam Danz 2019-7-8

What is bedtime(:)? Is it a vector of date/times in datetime format? Is it part of a timetable?

I recommend organizing your data into a timetable and then using retime() to calculate means and standard deviations.

Peter Perkins 2019-7-8

Michael, by your description you have 21 times; if that is a datetime array, it's easy to compute the mean (as a datetime) and the std dev (as a duration). But what's not clear is how many of those series you have. You mention scaling the x axis, but nothing more. I'm guessing maybe you have multiple subjects and want to plot each subject's mean with error bars.

This might be super easy if you have a timetable with all the data together, with a variable identifying which times go with which subject. Then you could use varfun, grouping by subject, to compute vectors of by-subject means and std devs, and plot them

But I think you're gonna need to provide more details.

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