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Using Yield functions

The present note tries to summarise some of the considerations which the crop forecaster should keep in mind when deriving multiple regression equations (so-called Yield Functions) which will eventually be used for forecasting crop yields. The process by which the coefficients of a yield function are derived are known as calibration15. The rules below are purely empirical or based on common sense:

crop production to a given variable is not linear, use a quadratic term in addition to the linear term.

quadratic terms.

respiration) and qualitative ones (e.g. male sterility induced by high temperatures).

Some additional advice

“automatic”) addition of variables to techniques with deletion of variables;

series);


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