crawford.test.freq {psycho}

Crawford-Howell (1998) frequentist 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.freq(patient, controls)

Arguments

patient

Single value (patient's score).

controls

Vector of values (control's scores).

Value

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

Author(s)

Dan Mirman, Dominique Makowski

Examples

library(psycho)

crawford.test.freq(patient = 10, controls = c(0, -2, 5, 2, 1, 3, -4, -2))
crawford.test.freq(patient = 7, controls = c(0, -2, 5, 2, 1, 3, -4, -2))