topic Re: How to back transform normal score transformed data with SAS software? in SAS Studio

How to back transform normal score transformed data with SAS software?

hsellemi — Fri, 09 Feb 2018 21:38:56 GMT

I used the normal scores transformation (Blom method) because of non normal distribution of my data. The Blom transformation is available as an automated option SAS software. My question is How back-transform of Blom transformation results to original data with SAS software?

Re: How to back transform normal score transformed data with SAS software?

PGStats — Fri, 09 Feb 2018 21:47:36 GMT

You need the original mean and std-dev to back transform. You shouldn't need to do this. Please describe what you are trying to do so that we can suggest alternative approaches.

Re: How to back transform normal score transformed data with SAS software?

hsellemi — Fri, 09 Feb 2018 22:07:30 GMT

Thank you for reply

After the Blom transformation of my data, i do it the ANOVA and the LSD TEST to check if this found some difference between
my treatments. I saw the LSD TEST was applied in the transformation data. For this reason i need to know the back-transformation
procedure of Blom transformation mean results of LSD test.

Re: How to back transform normal score transformed data with SAS software?

ballardw — Fri, 09 Feb 2018 22:15:41 GMT

@hsellemi wrote:

I used the normal scores transformation (Blom method) because of non normal distribution of my data. The Blom transformation is available as an automated option SAS software. My question is How back-transform of Blom transformation results to original data with SAS software?

You might provide some example data and what you think the result should be. It may also help to show the code you used to generate the transform in the first place.

Since BLOM involves ranks and the number of records before getting into the approximation you may have some fun ahead.