Box–Cox transform

• can be applied to the left-hand-side, right-hand-side, or both
• parameters can be the same or different
• maximum likelihood
• zero-skewness log

Power transforms

• search for power transform that converts variable into a normally distributed variable
• graphical display of power-transformed variable

Tests of normality

• Shapiro–Wilk
• Shapiro–Francia
• skewness and kurtosis test (D'Agostino with and without Royston correction)