snailsf: Aquatic snails hiding behaviour

In Flury: Data Sets from Flury, 1997

Description

Three subjsets of aquatic snail (Potamopyrgus antipodarum) were studied. Data were collected on diseased, juvenile and brooding females to assess the influence of infection on the behaviour of the snails. To avoid predation, snails are usually less likely to be found on the tops of rocks during the day.

Usage

data(snailsf)

Format

'snailsf' is a data frame with 27 observations on the following 6 variables.

Infected

a factor with levels 0 (not infected) and 1 (infected)

Juvenile

a factor with levels 0 and 1 (juvenile)

Brooding.Female

a factor with levels 0 1

Time

Time of day, in 24 hour clock notation

Found

Number of snails found on the top of a rock

Collected

Number of snails collected

Source

Data courtesy by E.Levri and C.Lively, Indiana University Department of Biology.

References

Flury, B.D. (1997) A First Course in Multivariate Statistics, New York: Springer

Examples

data(snailsf)
## Not run: 
S <- sin(snailsf$Time * pi/12)
C <- cos(snailsf$Time * pi/12)
snail.glm <- glm(cbind(Found, Collected-Found) ~ Infected + C + S,
  family = binomial, data = snailsf)
summary(snail.glm)
## End(Not run)

Flury documentation built on May 1, 2019, 6:50 p.m.