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Statistical resources
We have a comprehensive training manual which
illustrates statistical methodology with an
agricultural and environmental focus. An undergraduate knowledge
of basic statistics is all you need to follow the manual, which
takes you through design and analysis of experiments using the current
version of
GenStat.
GenStat Resources. Right-click to save, left-click to open:
Other Resources:
| Agronomy Journal |
Statistical Analysis of Field Trials with
Changing Treatment Variance.
Co-authored with Curt Lee, Agro-Tech Inc, North Dakota, USA. |
In-house paper
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146 KB pdf |
Uses ANOVA on data from a field trial, examines the residuals and identifies a trend running through the blocks, then re-analyses the data using Linear Mixed Models (REML). Co-authored with Curt Lee, Agro-Tech Inc, North Dakota, USA. |
| In-house paper |
644 KB pdf |
Compares a standard split-block analysis of an agricultural field experiment with a spatial analysis using Linear Mixed Models (REML). Co-authored with Curt Lee, Agro-Tech Inc, North Dakota, USA. |
Power & sample
size (2003 format)
Power and sample size (2007 format) |
0.5 MB xls
200 KB xlsm |
Calculates power
and/or required sample size for an experiment (see Mick
O'Neill & Peter Thomson in Australian Journal of Experimental Agriculture, 1998, 38 617-22; macro
updated by Maryann O'Donnell, 2004. |
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Template (2003 format)
Template (2007 format) |
284 KB xls
100 KB xlsm |
Excel file, uses Solver and
maximum likelihood to fit an inverse normal distribution
to the time to seed germination. |
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REML for a simple dataset |
0.5 MB xls |
Uses Excel to demonstrate the
difference between Maximum Likelihood and Residual
Maximum Likelihood estimates for a simple set of data
from a normal population. |
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Technical report 1 |
233 KB pdf |
Technical report
on fitting an inverse normal distribution. |
| Technical report 2 |
382 KB pdf |
Technical report
on the exact and approximate
distributions of Levene’s mean-based test
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CRD |
845 KB zipped xls |
Zipped file with moments of Levene's
median-based test for a completely randomised design. |
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general |
45 KB zipped xls |
Zipped file with data for 3 examples and tables of multipliers to convert ordinary least squares Levene's
test to weighted least squares test for general balanced designs. |
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