does pca include bell shaped variables which variable should be log transformed what variables are in the long tail when do you pause pca when to do pca with bell shaped variables can you use log transformation on long tail variables which variable is bell shaped why would i pca with a long tail does principal component analysis require log transformation what is the difference between pca and pca for long tails of variables what is long tail data can you use log transformation on long tail regression what is the definition of pca why do we do a pca with and without transform when do you do pca with bell shaped data why do you do pca why is log transformation needed in pca when is pca used when do you do pca? what type of data can be used for principal component analysis