Taguchi Logit Transformation in Minitab

P

PTRSVN

#1
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?

Thank you for your time in advance.
View attachment Taguchi logistic transformation.MPJ

View attachment Taguchi Elsmar.xlsx
 
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P

PTRSVN

#4
Thank for your reply but I want to do logit transformation and I want to find predicted values and "confidence interval".Could you help me about this situation.
 

Steve Prevette

Deming Disciple
Leader
Super Moderator
#5
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
Leader
Admin
#6
You can assign the logit equation to a blank column in Minitab using your data column(s) as variables in the equation.
 
P

PTRSVN

#8
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,

omega transformation.png
:magic:
 
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