[edit] Variable transformation
A number of classical methods, such as principal component analysis, multidimensional scaling, factor analysis, and structural equation modeling, and their relatives, fall under the genus of "variable transformation.
performing a Y variable transformation to achieve homoscedasticity. The Box-Cox normality plot can help determine a suitable transformation.
Impact of Ignoring Unequal Variability in the Data ...
An appropriate variable transformation then makes it possible to explicitely calculate the pdf of these variables.
 See also: Distribution, T distribution, Density, Probability density function, Estimation
  
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