skewness function

Skewness

Calculate skewness using one of three formulas: (1) the traditional Fisher-Pearson coefficient of skewness; (2) the adjusted Fisher-Pearson standardized moment coefficient; (3) the Pearson 2 skewness coefficient. Formulas were taken from Doane & Seward (2011), tools:::Rd_expr_doi("10.1080/10691898.2011.11889611")

skewness(vector = NULL, type = "adjusted")

Arguments

• vector: a numeric vector
• type: a character string indicating the type of skewness to calculate. If type = "adjusted", the adjusted Fisher-Pearson standardized moment coefficient will be calculated. If type = "traditional", the traditional Fisher-Pearson coefficient of skewness will be calculated. If type = "pearson_2", the Pearson 2 skewness coefficient will be calculated. By default, type = "adjusted".

Returns

a numeric value, i.e., skewness of the given vector

Examples

# calculate the adjusted Fisher-Pearson standardized moment coefficient
kim::skewness(c(1, 2, 3, 4, 5, 10))
# calculate the traditional Fisher-Pearson coefficient of skewness
kim::skewness(c(1, 2, 3, 4, 5, 10), type = "traditional")
# compare with skewness from 'moments' package
moments::skewness(c(1, 2, 3, 4, 5, 10))
# calculate the Pearson 2 skewness coefficient
kim::skewness(c(1, 2, 3, 4, 5, 10), type = "pearson_2")