CASE STUDIES IN BIOMETRY: Chapter 5.
Estimating Pine Seedling Response to Ozone and Acid Rain
John O. Rawlings and Susan E. Spruill
The data set ch5.dat contains the following variables:
1. site: coded 1-6 corresponding to the location code used in Table 1.
2. block: block within site coded 1, 2, ... within sites for the RCB designs;
block=1 for all observations for the CRD designs, sites 5 and 6.
3. rep: replication within site coded as missing in sites 1-4;
coded as 1, 2, ... for replicates in the CRD design.
4. ozone: target ozone treatment, coded 0.0=charcoal filtered air,
1.0=nonfiltered air, "x.x"=target level of ozone as multiple of
ambient ozone level.
5. rain: acidic rain treatment, coded as pH of rain solution.
6. fam: genetic family, coded as 1, 2, ... within sites.
7. ppmhrs: cumulative ozone exposure (ppm-h) during the two years of
the trials.
8. vwpH: cumulative exposure to acidic rain computed as vwpH
= -log(sum(volume*hydrogen ion concentration)).
9. biomass: total above ground biomass (g) after two growing seasons.
10. diam: increment of diameter growth (mm) during the two growing seasons.
11. DMA: whole-plot component of the covariate initial diameter (mm)
expressed as the deviation of the whole-plot mean from the overall
site mean.
12. DMB: sub-plot component of the covariate initial diameter (mm)
expressed as the deviation of the subplot mean from the whole-plot mean.
13. D2HA: whole-plot component of the covariate initial volume,
approximated as diameter squared times height, and expressed as
the deviation of the whole-plot mean from the overall site mean.
14. D2HB: sub-plot component of the covariate initial volume and
expressed as the deviation of the subplot mean from the whole-plot mean.
15. DMOT: depth to mottling (cm) of the clay soil; one measurement
per whole-plot.
Missing data are coded with '.'
NOTE: The authors have on file letters of permission from
each of the principal investigators to use the SCFRC data
in a chapter in the book entitled CASE STUDIES IN BIOMETRY,
and for the data used in this case study to
be made available to the readers.