
Jacobsen et al. (2002) sent nine "identical" soil samples to eight soil testing 
laboratories in the Great Plains region of the Central United States over a three year period of time. 
 Among other characteristics the labs were paid to measure soil potassium.  
A question of interest was whether the labs would produce identical analytical results.


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

K function

A data frame with 72 observations on the following 2 variables.
  <dl>
    <dt><code>K</code></dt><dd>Soil K in mg/kg</dd> <dt><code>lab</code></dt><dd>Laboratories, a factor with levels <code>B</code> <code>D</code> <code>E</code> <code>F</code> <code>G</code> <code>H</code> <code>I</code> <code>J</code></dd> </dl> 

Format

Jacobsen, J. S., Lorber, S. H., Schaff, B. E., and C. A. Jones (2002)  Variation in soil 
fertility test results from selected Northern Great Plains laboratories.  <em>Commun. Soil Sci. plant Anal.</em>, 33(3&4): 303-319.

K: Soil potassium analyses from 8 laboratories

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