I have some statistical data, with 4 - 5 columns, where the data fails a normality test in two columns. I need to do some statistical tests in Minitab, but need the data normal. How do you go about finding a common transformation in Minitab? I know how to do this in JMP, but now need to use Minitab.

In this case, you may use the Johnson Transformation which will help to select the best transform for the data to the normal distribution.

1. Choose Stat -> Quality Tools ->Johnson Transformation
2. Under "data are arrange as", choose single column which all the your data had key in (non normal distribution)
3. Under "store transformed data in", choose another single column which is in empty (Example C2)
4. Click options, in P-value to select best fit, you may use 0.05.
5. Click OK on each dialog box.

You may have a set of data which in the column C2 in the normal distribution.:D

Does Minitab not have Non-parametric statistical tests? I am wondering if you cannot just work with all of the data and use non-parametric statistics.