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May someone write the inverse of the FOUR-parameters Weibull cumulative distribution (percent point function), please? I am referring to the 4-parameters formula appearing in Sigmaplot.

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  • $\begingroup$ There probably is no formula for the inverse. $\endgroup$
    – Matt F.
    May 31 at 19:55
  • $\begingroup$ Existing for the three-parameters distribution, I wonder if it also exists for the four-parameters one. $\endgroup$
    – Alex ME
    Jun 1 at 6:29

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