Logarithmic transformations can normalize skewed or kurtotic data for purposes of analysis
The means and standard deviations of these transformed variables cannot be interpreted in the traditional sense. Only the p-value yielded from the analysis can be interpreted. Medians and interquartile ranges for the respective distributions should be reported for descriptive purposes.
The steps for conducting logarithmic transformations in SPSS
2. Click Compute Variable.
3. In the Target Variable: box, give the outcome a new name that reflects it has been transformed.
4. Click on the continuous outcome variable to highlight it.
5. Click on the arrow button to bring the variable over into Numeric Expression: box.
6. Type "ln" and put parentheses around the variable. Example: ln(outcome)
7. Click OK.
8. In the Data View tab of SPSS, there is a new transformed outcome variable.
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