psycho (version 0.1.4)

crawford.test: Crawford-Howell (1998) t-test for single-case analysis.

Description

Neuropsychologists often need to compare a single case to a small control group. However, the standard two-sample t-test does not work because the case is only one observation. Crawford and Garthwaite (2012) demonstrate that the Crawford-Howell (1998) t-test is a better approach (in terms of controlling Type I error rate) than other commonly-used alternatives. .

Usage

crawford.test(case, controls, verbose = T)

Arguments

case

Single value.

controls

Vector of values.

verbose

True or False. Prints the interpretation text.

Value

Returns a data frame containing the t-value, degrees of freedom, and p-value. If significant, the case is different from the control group.

Examples

# NOT RUN {
crawford.test(case = 10, controls = c(0, -2, 5, 2, 1, 3, -4, -2))

# }