epiCo (version 1.0.1)

geometric_sd: Returns the geometric standard deviation of a vector of real numbers.

Description

Function that returns the geometric standard deviation of a vector of real numbers according to the selected method.

Usage

geometric_sd(
  x,
  method = c("positive", "shifted", "optimized", "weighted"),
  shift = 1,
  delta = 0.001
)

Value

The geometric mean of the x vector, and the epsilon value if optimized method is used.

Arguments

x

A numeric vector of real values

method

Description of methods:

• positive = only positive values within x are used in the calculation.

• shifted = positive and zero values within x are used by adding a shift value before the calculation and subtracting it to the final result.

• optimized = optimized shifted method. See: De La Cruz, R., & Kreft, J. U. (2018). Geometric mean extension for data sets with zeros. arXiv preprint arXiv:1806.06403.

• weighted = a probability weighted calculation of gm for negative, positive, and zero values. See: Habib, E. A. (2012). Geometric mean for negative and zero values. International Journal of Research and Reviews in Applied Sciences, 11(3), 419-432.

shift

a positive value to use in the shifted method

delta

an positive value (shift) used in the optimized method.

Examples

x <- c(4, 5, 3, 7, 8)
geometric_sd(x, method = "optimized")