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3 parameter Weibull curves

afiore
1-Visitor

3 parameter Weibull curves

Hello PTC Community,

I recently created a 3 parameter Weibull plot. I understand the basics of 2 paramater vs. 3 parameter and time shifting using γ (gamma).

If you look at the 3-parameter Weibull plot below, the curved line is the unshifted data. My question for everyone is, what is that line? If you plot the unshifted data using 2-parameters, the line looks straight. However, when you plot it using a 3-parameters, then we see a curved unshifted line. Does anyone have any insight into this?

2-parameter Weibull plot

2parameter.png

3-parameter Weibull plot (curved line is probability line [unshifted data], straight line is shifted data)

3parameter.png

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