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- 2011-7-11
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2#
发表于 2011-7-13 16:32
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I think I may have an idea. The (n+1) is used to indicate the position, and when you have a total of n variables, you have a total of (n+1) intervals. And the y/100 is the percentage indicating the position when the variables are ascending.
So, for example if you have to calculate the position of the 50th percentile of a number of 4 observations, the formula will be: L=5*50/100=2,5. Which is logical when you come to think of it in practice.
I did get this one, though I'm not too good at explaining,  sorry.
Cheers,
T. |
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