sitka {gamair}

Sitka spruce growth data.

Description

Tree growth data under enhanced ozone and control conditions.

Usage

data(sitka)

Format

A data frame with 1027 rows and 5 columns columns:

id.num

identity of the tree: 1...79.

order

time order ranking within each tree.

days

since 1st January, 1988.

log.size

log of tree ‘size’.

ozone

1 - enhanced ozone treatment; 0 - control.

Details

The data were analysed in Crainiceanu CM, Ruppert D, Wand MP (2005) using WinBUGS, and in Wood (2016) using auto-generated JAGS code.

Source

The SemiPar package, from:

Diggle, P.J, Heagery, P., Liang, K.-Y. and Zeger, S.L. (2002) Analysis of Longitudinal Data (2nd ed.) OUP.

References

Wood SN (2016) "Just Another Gibbs Additive Modeller: Interfacing JAGS and mgcv" Journal of Statistical Software 75

Crainiceanu C.M., Ruppert D. and Wand M.P. (2005). "Bayesian Analysis for Penalized Spline Regression Using WinBUGS." Journal of Statistical Software, 14(14).

Examples

  require(gamair); require(lattice)
  data(sitka)
  xyplot(log.size~days|as.factor(ozone),data=sitka,type="l",groups=id.num)