Wheat2 {nlme} | R Documentation

## Wheat Yield Trials

### Description

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

### Details

### Source

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

### Examples

    data(Wheat2)

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