I would like to ask how to interpret both naturally log-transformed data and square root data after getting the results from the SPSS analysis
should I report both values as below or the back-transformed means with the CI are enough?
For square root data :
The arithmetic mean obtained from the statistical analysis of the square rooted transformed data was 2.209 with 95 % confidence interval between (1.8, 2.62) for group 1. When the data is back-transformed for proper presentation, the mean od group 1 should be 4.87 days with 95 % confidence interval between (3.24, 6.86)? simply back-transformed the value by self multiplication? is that correct?
For Natural log-transformed data (LN) :
the mean obtained from SPSS was 2.59 was a confidence interval of (1.703, 3.48)
I couldn't understand how should I report back the natural log!
could you please give me a clue on how to report such result?
Thank you
Hi Mohamed Badawy
I am trying to figure out the answer to your question, as well. Did you ever find out how to back-transform the square root transformation?
Thanks,
Alex
Thank you for your comment. Simply revert the numbers again after the analysis if you used LoG 10 simply revert the number back to show the back transformed results if it means any thing to the reader. In my situation data was about half life of pesticide so it was crucial to back-transform the data for readers to make sense of the numbers.
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