Capability Analysis after Box-Cox

This topic has 1 reply, 2 voices, and was last updated 12 years, 11 months ago by Maciek.

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March 27, 2007 at 8:52 am #46540

Grzegorz
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When data are not follow normal distribution Capability Analysis we are using Box-Cox Transformation before to catch the lambda parameter.After Box-Cox Transformation we can’t use historical mean. Why?
Can we use transformed data (after Box-Cox Transformation) instead of collected data without using Box-Cox option during Capability Analysis?
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March 27, 2007 at 11:54 am #154024

Maciek
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You can’t use historical mean because during transformation Box-Cox your data are modified by mathematical transformation. During Box-Cox tranformation you need to transform your USL and LSL as well. I hope its helps..
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