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Statistics of Ratios
Message posted by Kevin on October 5, 1999 at 12:00 AM (ET)
I'm working with a data set that includes a ratio.
The distribution of the ratio data is not a normal distribution, because the ratio can never be less then one... So I end up with an F distribution looking plot.
The questions,
Do standard deviation and mean apply?
How do I calculate the probability that a part is in spec?
Is there a way to convert the data to a normal distribution?
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Re: Statistics of Ratios
Message posted by JG on October 6, 1999 at 12:00 AM (ET)
Every distribution has a mean and standard deviation unless these are infinite. If your distribution resembles a lognormal then you can probably transform it to a normal.
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