Basically, I am checking for outliers in a 'frequency of use' construct measured in number of weeks. Since the box plot was right-skewed, i conducted a log transformation via spss. Although, the result seemed fine but now I want to create boxplots for other constructs which are measured on 7-point likert scales however, 'frequency of use' is not. My question is how do I perform a linear tranformation (preferably in SPSS) on the new 'frequency of use' scale so that it can be measured on a 7-point likert scale like the others when doing the box plots?

Please let me know if any part of my question is unclear.

Thanks