Chimp Learning Times

Description

Researchers taught each of 4 chimps to learn 10 words in American sign language and recorded the learning time for each word for each chimp. They wished to describe chimp differences and word differences.

Usage

case1401

Format

A data frame with 40 observations on the following 3 variables.

Minutes

learning time in minutes

Chimp

a factor indicating chimp, with four levels "Booee", "Cindy", "Bruno" and "Thelma"

Sign

a factor indicating word taught, with 10 levels

Source

Ramsey, F.L. and Schafer, D.W. (2002). The Statistical Sleuth: A Course in Methods of Data Analysis (2nd ed), Duxbury.

References

Fouts, R.S. (1973). Acquisition and Testing of Gestural Signs in Four Young Chimpanzees, Science 180: 978-980.

Examples

str(case1401)

fitadditive <- aov(Minutes ~ Chimp + Sign, case1401)
# Residual plot indicates a transformation may help
plot(fitadditive) 

fitadditive <- aov(log(Minutes) ~ Chimp + Sign, case1401)
# No problems are indicated by residual plot
plot(fitadditive) 
anova(fitadditive)

# Tukey multiple comparisons of sign differences
mcSign <- TukeyHSD(fitadditive,"Sign")  
mcSign
plot(mcSign)
mcChimp <- TukeyHSD(fitadditive,"Chimp")
mcChimp
par(cex=.7)
plot(mcChimp)