cochran.beets {agridat} | R Documentation

## Yield and number of plants in a sugarbeet fertilizer experiment

### Description

Yield and number of plants in a sugarbeet fertilizer experiment.

### Usage

    data("cochran.beets")

### Format

A data frame with 42 observations on the following 4 variables.

`fert`

  fertilizer treatment

`block`

  block

`yield`

  yield (tons/acres)

`plants`

  number of plants per plot

### Details

Yield (tons/acre) and number of beets per plot. Fertilizer treatments combine superphosphate (P), muriate of potash (K), and sodium nitrate (N).

### Source

George Snedecor (1946). Statisitcal Methods, 4th ed. Table 12.13, p. 332.

### References

H. Fairfield Smith (1957). Interpretation of Adjusted Treatment Means and Regressions in Analysis of Covariance. Biometrics, 13, 282-308. http://doi.org/10.2307/2527917

### Examples

    data(cochran.beets)
    dat = cochran.beets

    # P has strong effect
    require(lattice)
    xyplot(yield ~ plants|fert, dat, main="cochran.beets")

[Package agridat version 1.16 Index]