tidal {gamlss.data} | R Documentation |
The tidal data set
Description
The dataset tidal
, McArdle and Anderson (2004), gives counts of the organism
"intertidal bivalve A. Stutchburyi" in three tidal areas
in the Bay of Plenty, New Zealand.
Usage
data("tidal")
Format
A data frame with 90 observations on the following 3 variables.
number
count of
A. Stutchburyi
organismsvertht
vertical tidal height (m)
ht
tidal area, a factor with three level
Details
The dataset gives counts of the organism "intertidal bivalve A. Stutchburyi" in three tidal areas in the Bay of Plenty, New Zealand. Each observation is the count of the number of these organisms in a 0.25 m quadrat, as well as the vertical tidal height of the quadrat. The vertical heights have been classified into three tidal areas: upper (vertical height > 0.66m), middle (0.33- 0.66 m) and lower (<0.33 m). Ecologists are interested in the effect of tidal height (either raw or classified) on the number of organisms.
Source
McArdle and Anderson (2004)
References
McArdle, B. H. and Anderson, M. J. (2004), Variance heterogeneity, transformations, and models of species abundance: a cautionary tale, Canadian Journal of Fisheries and Aquatic Sciences, 7, vol 61, pp 1294-1302, NRC Research Press.
Examples
str(tidal)
plot(number~vertht, data=tidal)
plot(number~ht, data=tidal)