case1401: Chimp Learning Times

Description Usage Format Source References Examples

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

1

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

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
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)

Sleuth2 documentation built on Jan. 24, 2019, 9:04 a.m.