Wheat2 dataset

Wheat Yield Trials

The Wheat2 data frame has 224 rows and 5 columns.

Format

This data frame contains the following columns:

• Block: an ordered factor with levels 4 < 2 < 3 < 1

• variety: a factor with levels ARAPAHOE

    `BRULE`
   
    `BUCKSKIN`
   
    `CENTURA`
   
    `CENTURK78`
   
    `CHEYENNE`
   
    `CODY`
   
    `COLT`
   
    `GAGE`
   
    `HOMESTEAD`
   
    `KS831374`
   
    `LANCER`
   
    `LANCOTA`
   
    `NE83404`
   
    `NE83406`
   
    `NE83407`
   
    `NE83432`
   
    `NE83498`
   
    `NE83T12`
   
    `NE84557`
   
    `NE85556`
   
    `NE85623`
   
    `NE86482`
   
    `NE86501`
   
    `NE86503`
   
    `NE86507`
   
    `NE86509`
   
    `NE86527`
   
    `NE86582`
   
    `NE86606`
   
    `NE86607`
   
    `NE86T666`
   
    `NE87403`
   
    `NE87408`
   
    `NE87409`
   
    `NE87446`
   
    `NE87451`
   
    `NE87457`
   
    `NE87463`
   
    `NE87499`
   
    `NE87512`
   
    `NE87513`
   
    `NE87522`
   
    `NE87612`
   
    `NE87613`
   
    `NE87615`
   
    `NE87619`
   
    `NE87627`
   
    `NORKAN`
   
    `REDLAND`
   
    `ROUGHRIDER`
   
    `SCOUT66`
   
    `SIOUXLAND`
   
    `TAM107`
   
    `TAM200`
   
    `VONA`
  

• yield: a numeric vector

• latitude: a numeric vector

• longitude: a numeric vector

Source

Pinheiro, J. C. and Bates, D. M. (2000), Mixed-Effects Models in S and S-PLUS, Springer, New York.