Since the sum of all the entries in the bins adds up to the length of the growing season, one bin must be excluded from the regression. [...] The choices of the width of the bins, the number of bins, and the range of the bins are up to the researcher. [...] To put it differently, the marginal impact on yields of a single day with an average temperature of 21-23oC is the same regardless of when the hot day occurs during the growing season and regardless of the average temperature during the rest of the growing season. [...] However, the interaction terms tended to capture most of the variation in the yield impacts of GDD in the model results, and so the GDD variables were removed to form the second model. [...] The results also indicate that timing of precipitation and temperature influence yields differently in terms of the magnitude and significance of the impacts.
Authors
- Pages
- 45
- Published in
- Canada
