What question did this study set out to answer?

To establish a statistically sound, objective method for defining critical soil test levels that partition correlation data into two distinct classes for fertilizer recommendations.

July 1, 1971Soil Science Society of America Journal

A Simple Statistical Procedure for Partitioning Soil Test Correlation Data Into Two Classes

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Authors

RCRobert B. CateTechnicolor (Germany)LNLarry A. NelsonNorth Carolina State University

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Implication

Methodological evaluation demonstrates that maximizing predictive ability partitions soil test correlation data into two distinct fertility classes, suggesting broad utility for fertilizer guidance.

Key Points

To establish a statistically sound, objective method for defining critical soil test levels that partition correlation data into two distinct classes for fertilizer recommendations.
Iterated through successive tentative critical levels across soil test data to identify the threshold that maximizes overall predictive ability (R²) using class means as predictors.
Fitted multiple continuous correlation models to an illustrative soil test dataset to evaluate comparative predictive performance.
Tested the two-class partitioning procedure across 200 independent sets of soil test correlation data.
The proposed Low-High partitioning procedure yielded a higher R² than any evaluated continuous correlation model on the example dataset.
Superior predictive performance of the two-class split was reproduced across the majority of 200 evaluated soil test correlation datasets.

Cite This Study

Cate et al. (1971) studied this question.

synapsesocial.com/papers/6a87c334e6314279fbfb0b07 https://doi.org/10.2136/sssaj1971.03615995003500040048x

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Implication

Methodological evaluation demonstrates that maximizing predictive ability partitions soil test correlation data into two distinct fertility classes, suggesting broad utility for fertilizer guidance.

A Simple Statistical Procedure for Partitioning Soil Test Correlation Data Into Two Classes

Discussion

Member takes

Implication

Key Points

Cite This Study

A Simple Statistical Procedure for Partitioning Soil Test Correlation Data Into Two Classes

Discussion

Member takes

Implication

Key Points

Cite This Study

Also Consider

Also Consider