rcompanion (version 1.13.2)

groupwiseHuber: Groupwise Huber M-estimators and confidence intervals

Description

Calculates Huber M-estimator and confidence intervals for groups.

Usage

groupwiseHuber(formula = NULL, data = NULL, var = NULL, group = NULL,
  conf.level = 0.95, ci.type = "wald", ...)

Arguments

formula

A formula indicating the measurement variable and the grouping variables. e.g. y ~ x1 + x2.

data

The data frame to use.

var

The measurement variable to use. The name is in double quotes.

group

The grouping variable to use. The name is in double quotes. Multiple names are listed as a vector. (See example.)

conf.level

The confidence interval to use.

ci.type

The type of confidence interval to use. Can be "wald" or "boot". See HuberM for details.

...

Other arguments passed to the HuberM function.

Value

A data frame of requested statistics by group.

Details

A wrapper for the HuberM function to allow easy output for multiple groups.

The input should include either formula and data; or data, var, and group. (See examples).

References

http://rcompanion.org/rcompanion/d_08a.html

See Also

groupwiseMean, groupwiseMedian groupwiseGeometric

Examples

# NOT RUN {
### Example with formula notation
data(Catbus)
groupwiseHuber(Steps ~ Teacher + Sex,
               data      = Catbus,
               ci.type = "wald")
               
### Example with variable notation
data(Catbus)
groupwiseHuber(data      = Catbus,
               var       = "Steps",
               group     = c("Teacher", "Sex"),
               ci.type = "wald")
                                      
# }