I have some statistical data from which I want to graph the means and use the standard deviations as error bars. However this produces a graph with some of the error bars passing below zero. A negative value is silly for this data (mean trip times), so I was wondering what is a sensible way to graph the data.
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http://meta.mathoverflow.net/discussion/34/5/tag-mergerename-requests/#Item_28
Federico Poloni
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Is it alright for STD error bars to be below zero?
hoju
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