WRS2 (version 0.2-0)

tsplit: A robust two-way mixed ANOVA (split-plot) for trimmed means.

Description

This function computes a two-way between-within subjects ANOVA on the trimmed means. It allows for one between subjects-variable and for one within-subjects variable.

Usage

tsplit(formula, random, data, tr = 0.2)

Arguments

formula

an object of class formula.

random

within subject specification (random effects style)

data

an optional data frame for the input data.

tr

trim level for the mean.

Value

• Returns an object of class t2way containing:
• Qa
  first main effect
• A.p.value
  p-value first main effect
• Qb
  second main effect
• B.p.value
  p-value second main effect
• Qab
  interaction effect
• AB.p.value
  p-value interaction effect
• call
  function call
• varnames
  variable names

References

Wilcox, R. (2012). Introduction to Robust Estimation and Hypothesis Testing (3rd ed.). Elsevier.

See Also

t2way

Examples

## data need to be on long format
pictureLong <- reshape(picture, direction = "long", varying = list(3:4), idvar = "case", 
timevar = c("pictype"), times = c("couple", "alone"))
colnames(pictureLong)[4] <- "friend_requests"

tsplit(friend_requests ~ relationship_status*pictype, random = ~1|case/pictype, data = pictureLong)