Grain {PairedData} | R Documentation |
Grain data from Preece (1982, Table 5)
Description
This dataset presents 9 paired data corresponding to the grain yields of Great Northern and Big Four oats grown in "adjacent" plots.
Usage
data(Grain)
Format
A dataframe with 9 rows and 3 columns:
[,1] | Year | factor | |
[,2] | GreatNorthern | numeric | grain yield (bushels per acre) |
[,3] | BigFour | numeric | grain yield |
Source
LeClerg, E.L., Leonard, W.H. & Clark, A.G. (1962) Field Plot Technique. Burgess: Minneapolis.
References
Preece, D.A. (1982) t is for trouble (and textbooks): a critique of some examples of the paired-samples t-test. The Statistician, 31 (2), 169-195.
Examples
data(Grain)
# Usual visualization for paired data (2 clusters?)
with(Grain, plot(paired(GreatNorthern,BigFour)))
# Are they actually "adjacent" plots?
# Why this variable Year?
# Is there any time trend?
with(Grain, plot(Year,GreatNorthern,type="o"))
with(Grain, plot(Year,BigFour,type="o"))
[Package PairedData version 1.1.1 Index]