GraphPad Statistics Guide

Testing for lognormality

Testing for lognormality

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Testing for lognormality

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Prism can test the fit of your distribution to a lognormal distribution, using four different lognormality tests. It does so simply. It first computes the logarithm of all the values, and then does the normality test(s) on the logarithms.

If any of the values are zero or negative, the distribution cannot possibly be lognormal, so Prism won't perform the lognormality tests.