shoe {SMPracticals} | R Documentation |
Amount of wear in a paired comparison of two materials used for soling the shoes of 10 boys. The materials were allocated randomly to the left and right feet.
data(shoe)
A data frame with 20 observations on the following 4 variables.
Box, G. E. P., Hunter, W. G. and Hunter, J. S. (1978) Statistics for Experimenters. New York: Wiley. Page 100.
Davison, A. C. (2003) Statistical Models. Cambridge University Press. Page 422.
data(shoe) attach(shoe) d <- y[material=="B"]-y[material=="A"] # difference t.test(d) # t test of hypothesis that B wears quicker