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Use of Segmented Regression in the Determination of the Base Temperature in Heat Accumulation Models¹

An accurate determination of the base temperature in heat accumulation models is extremely important if the model is to be used for predictive purposes. A modification of the simple linear regression is proposed for estimating the base temperature from laboratory data. The results of a small simulation study indicate that the proposed method is more accurate than a commonly used method. A numerical example of the use of the proposed method is presented.

Key Words: Sorghum bicolor (L.) Moench • GDD • Base temperature estimation • Heat accumulation methods • Segmented regression • non-linear regression

² Assistant professor, Institute of Statistics; instructor, Dep. of Soil and Crop Sci.; associate professor, Dep. of Soil and Crop Sci., and Texas Agric. Exp. Stn.; Texas A&M Univ.

Received for publication October 6, 1978.

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