VarianceTest function

Variance Test

VarianceTest performs variance homogeneity tests including Ftest, Bartlett, Brown-Forsythe and Fligner-Killeen tests.

VarianceTest(
  formula,
  data,
  alpha = 0.05,
  method = c("Bartlett", "Brown-Forsythe", "Fligner-Killeen", "Fisher", "Levene"),
  na.rm = TRUE
)

Arguments

• formula: a formula of the form lhs ~ rhs where lhs gives the sample values and rhs the corresponding groups.
• data: a tibble or data frame containing the variables in the formula formula
• alpha: the level of significance to assess variance homogeneity. Default is set to alpha = 0.05.
• method: a character string to select one of the variance homogeneity tests: "Bartlett", "Brown-Forsythe", "Fisher" and "Fligner-Killeen".
• na.rm: Ha logical value indicating whether NA values should be stripped before the computation proceeds.

Returns

Get bivariate portfolio weights

References

Antonakakis, N., Cunado, J., Filis, G., Gabauer, D., & de Gracia, F. P. (2020). Oil and asset classes implied volatilities: Investment strategies and hedging effectiveness. Energy Economics, 91, 104762.

Author(s)

David Gabauer