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  • #16
    Sorry, I can't answer #15 without some context. It looks like a question already answered previously.

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    • #17
      Originally posted by Rose Matthews View Post

      Is it possible to know the value 1.2 lies in terms of the standard deviation so I can insert a line.
      The unit on the x-axis is a standard deviation.

      Originally posted by Rose Matthews View Post
      I know the 95th centile lies on the 1.96 standard deviation...
      No, you do not. That rule only applies if your variable is normally distributed, which looking at the graph in #1 is clearly not the case. If you want to look at centiles , then you need to look at centiles, not at standard deviations. The two are completely different in your case.
      ---------------------------------
      Maarten L. Buis
      University of Konstanz
      Department of history and sociology
      box 40
      78457 Konstanz
      Germany
      http://www.maartenbuis.nl
      ---------------------------------

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      • #18
        Nick Cox : #14 is an extremely good read -- thanks a lot for this "more than you were expecting"! I assume one day we will be able to read your draft worked out into a full paper.

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