# Taguchi Logit Transformation in Minitab

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#### PTRSVN

Hi,

I can not solve my problem about logit transformation. The responses are % crystallinity so I should do logit transformation to the response data. But I can not do this transformation. Because minitab did not accept negative values. Is there any way to do this with minitab?

And the other question is how can I find the "confidence interval" in this situation?

View attachment Taguchi logistic transformation.MPJ

View attachment Taguchi Elsmar.xlsx

#### Stijloor

Super Moderator
A Quick Bump!

Can someone help?

Thank you very much!!

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#### supreecha

Taguchi Design (We can do it by Minitab )

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#### Steve Prevette

##### Deming Disciple
Super Moderator
Two things looking at your data:

You do not have any negative numbers. Are you trying to interpret 7 E-7 as a negative number? That notation implies 7 times 10 to the negative 7th power, or .00007%.

I also assume that the 7 E-7 values are really zeroes and probably 7 E-7 is the minimum detectable percentage.

#### Miner

##### Forum Moderator
You can assign the logit equation to a blank column in Minitab using your data column(s) as variables in the equation.

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#### supreecha

Signal-to-noise: Smaller is better

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#### PTRSVN

Thank you for everybody.

I found my question's answer. I attached an image which explains logit (omega) transformation. It can help if anyone wants to do logit transformation,

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