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Thread: Help with graph apparently showing standard deviation with 2 values?!

  1. #1
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    Help with graph apparently showing standard deviation with 2 values?!




    Hi,

    I've got a presentation on a scientific paper this afternoon and am very confused with a graph in the paper (graph/dot plot C). I hope this doesn't break forum rules, I do believe this is a statistics question. Basically, in the plot on the far right (C), it shows values +/- standard deviation. However, the SD bars dont cover both values for each dose (x axis). From my understanding, SD with 2 points must be equal by definition as they are both equidistant from their mean.

    Is this true, or am i understanding this plot very wrongly?

    Many thanks

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  2. #2
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    Re: Help with graph apparently showing standard deviation with 2 values?!


    It looks as if the long bar is the mean and the short bars show the SD. If this is the case, then there are a couple of down bars which have been missed by mistake.

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