Transformation methods.

• logTrafo
  Natural logarithm.

• sqrtTrafo
  Square root.

If negative values occur and the trafo function can handle only positive values, a shift of the form x - min(x) + 1 is performed prior to the transformation if the argument handle.violations is set to “warn” which is the default value.

trafoLog(base = 10, handle.violations = "warn")

trafoSqrt(handle.violations = "warn")

Format

None

Arguments

base

[numeric(1)]
The base with respect to which logarithms are computed. Default is 10.

handle.violations

[character(1)]
What should be done, if negative values occur? Setting this option to “warn”, which is the default, shifts the function. “error” stops the process immediately.