Regression analysis | Logarithms

Smearing retransformation

The Smearing retransformation is used in regression analysis, after estimating the logarithm of a variable. Estimating the logarithm of a variable instead of the variable itself is a common technique to more closely approximate normality. In order to retransform the variable back to level from log, the Smearing retransformation is used. If the log-transformed variable y is normally distributed with mean and variance then, the expected value of y is given by: (Wikipedia).

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Related pages

Normal distribution | Regression analysis | Logarithm