potato {asbio}

Fisher's Rothamsted potato data

Description

In his "Statistical Methods for Research Workers" Fisher (1925) introduced the world to ANOVA using data from the Rothamsted Agricultural Experimental Station. In one example, Fisher compared potato yield (per plant) for twelve potato varieties and three fertilizer treatments (a basal manure application, along with sulfur and chloride addition). Three replicates were measured for each of the 12 x 3 = 36 treatment combinations.

Usage

data(potato)

Format

A data frame with 108 observations on the following 4 variables.

Yield

Potato yield in lbs per plant

Variety

Potato variety: Ajax Arran comrade British queen Duke of York Epicure Great Scot Iron duke K of K Kerrs pink Nithsdale Tinwald perfection Up-to-date

Fert

Fertilizer type: B = basal manure, Cl = chloride addition, S = sulfur addition.

Patch

Feld patch number 1 2 3 4 5 6 7 8 9

Source

Fisher, R. A. (1925) Statistical Methods for Research Workers, 1st edition. Oliver and Boyd, Edinburgh

Thanks to Bob O'Hara for finding a data entry error for this dataset for versions of asbio <= 1.8-2.