potash

An oft-cited RCBD example is an agricultural experiment which evaluates the effect of levels of of soil K\(_2\)O (potash) on 
the breaking strength of cotton fibers (Cochran and Cox 1957). Five levels of K\(_2\)O were used in the soil subplots (
36, 54, 72, 108, and 144 lbs per acre) and a single sample of cotton was taken from each of five subplot. 
The experiment had three blocks, and each of the K\(_2\)O treatments was randomly assigned to the five subplots within each block.

datasets

Contains functions from: Aho, K. (2014) Foundational and Applied Statistics for Biologists using R.  CRC/Taylor and Francis, Boca Raton, FL, ISBN: 978-1-4398-7338-0.

Ken Aho

asbio

A Collection of Statistical Tools for Biologists

potash function

A data frame with 15 observations on the following 3 variables.<dl>
 <dt><code>treatment</code></dt>
<dd>a factor with levels <code>36</code> <code>54</code> <code>72</code> <code>108</code> <code>144</code></dd> <dt><code>block</code></dt>
<dd>a factor with levels <code>1</code> <code>2</code> <code>3</code></dd> <dt><code>strength</code></dt>
<dd>a numeric vector</dd> 
</dl>

Format

Potash/cotton strength data — potash

A data frame with 15 observations on the following 3 variables.<dl>
 <dt><code>treatment</code></dt>
<dd>a factor with levels <code>36</code> <code>54</code> <code>72</code> <code>108</code> <code>144</code></dd>

 <dt><code>block</code></dt>
<dd>a factor with levels <code>1</code> <code>2</code> <code>3</code></dd>

 <dt><code>strength</code></dt>
<dd>a numeric vector</dd>

 
</dl>

potash: Potash/cotton strength data

Description

Usage

Arguments

Format