soiltreat: Soil treatment experiment in tree seedlings

In datana: Datasets and Functions to Accompany Analisis De Datos Con R

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)

datana documentation built on June 13, 2025, 1:11 a.m.