soiltreat {datana} | R Documentation |
Soil treatment experiment in tree seedlings
Description
A test was made of the effect of three soil treatments on the height growth of 2-year-old seedlings. Treatments were assigned at random to the three plots within each of 11 blocks. Each plot was made up of 50 seedlings. Average 5-year height growth was the criterion for evaluating treatments.
Usage
data(soiltreat)
Format
Contains the four following columns, at the plot-level,
- block
Block unit.
- treat
Treatment level.
- ini.h
Initial height, in m.
- inc.h
Increment in height during 5-year, in m.
Source
Table in page 71 of Freese (1967). The data were entered by Miss Nayeli Ramirez, a former student of Prof. Christian Salas-Eljatib.
References
Freese, F 1967. Elementary statistical methods for foresters. Agriculture Handbook 3171, USDA Forest Service.
Examples
data(soiltreat)
head(soiltreat)
tapply(soiltreat$inc.h,soiltreat$treat,summary)
tapply(soiltreat$inc.h,soiltreat$treat,sd)
[Package datana version 1.1.1 Index]