The Pooled Standard Deviation is a weighted average of standard deviations for two or more groups, with more "weight" given to larger sample sizes.
sd_pooled(x, y = NULL, data = NULL) mad_pooled(x, y = NULL, data = NULL)
A formula, a numeric vector, or a name of one in
A numeric vector, a grouping (character / factor) vector, a or a name of one in
An optional data frame containing the variables.
Numeric, the pooled standard deviation.
sd_pooled(mpg ~ am, data = mtcars)#>  4.902029