Normal Distribution Error Bars
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Error Bars For Median
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How To Interpret Error Bars
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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more http://mathoverflow.net/questions/4840/is-it-alright-for-std-error-bars-to-be-below-zero about Stack Overflow the company Business Learn more about hiring developers or posting ads with us MathOverflow Questions Tags Users Badges Unanswered Ask Question _ MathOverflow is a question and answer site for professional mathematicians. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top error bars Is it alright for STD error bars to be below zero? up vote 1 down vote favorite 1 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 a data set what is a sensible way to graph the data. st.statistics mathematical-writing exposition share|cite|improve this question edited Jul 6 '12 at 8:44 Federico Poloni 8,37323460 asked Nov 10 '09 at 10:50 hoju 12216 1 Perhaps you could clarify what you mean by STD? Is it standard deviation? Also, you could use the [statistics] tag. –Sonia Balagopalan Nov 10 '09 at 12:47 1 Yes, "STD" is an unfortunate acronym. –Theo Johnson-Freyd Nov 10 '09 at 19:04 in the context of a math question, do you really need clarification what STD means? –hoju Nov 10 '09 at 20:30 add a comment| 4 Answers 4 active oldest votes up vote 7 down vote accepted Your error bars may be giving you a hint to look more closely at the distribution of your data: it may not be symmetric. For example, if your data is essentially log-normal you could work with the logs of your numbers and the problem will automatically go away. I'm not a fan of error bars. In theory they let you visually do some statistical significance estimates and perhaps give some sense of the underlying data. But there are a lot of subtleties and at least one