The Iowa Wheat Yield Data

Description

The data gives the pre-season and three growing months' precipitation, the mean temperatures for the three growing months and harvest month, the year, and the yield of wheat for the USA state of Iowa, for the years 1930–1962.

Usage

data(Iowa)

Format

The data frame has the following components:

Year

Year of measurement (surrogate for variety improvements)

Rain0

Pre-season rainfall (in.)

Temp1

Mean temperature for the first growing month (deg. F)

Rain1

Rainfall for the first growing month (in.)

Temp2

Mean temperature for the second growing month (deg. F)

Rain2

Rainfall for the second growing month (in.)

Temp3

Mean temperature for the third growing month (deg. F)

Rain3

Rainfall for the third growing month (in.)

Temp4

Mean temperature for the harvest month (deg. F)

Yield

Yield of wheat in Iowa for the given year (bush./acre)

CATEGORY

Multiple regression; diagnostics.

Source

CAED Report, 1964. Quoted in Draper and Smith, Applied Regression Analysis.

Examples

data(Iowa)
pairs(Iowa)

Results