Journal
EUROPEAN JOURNAL OF AGRONOMY
Volume 45, Issue -, Pages 1-6Publisher
ELSEVIER
DOI: 10.1016/j.eja.2012.10.003
Keywords
Biological interpretation; Log-logistic curve; Parametric models; Standard errors; Time-to-event data
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Expensive agricultural experiments deserve to be analyzed as efficiently as possible by extracting as much information as possible from the data while respecting the experimental design. We consider experiments where germination in response to time elapsed is used to characterize germination performance and vigour. We formulate statistical models in a biologically meaningful framework in such a way that the inherent data structure, which centers around repeatedly monitoring seeds over time, is duly incorporated in the statistical analysis. Consequently, estimation and model checking procedures are based on treating the data as event times, that is, to record the time it takes for germination (the event of interest) to occur. The key result is that the use of appropriate statistical models is important in order to get a better appreciation of the uncertainty that is present in germination experiments. (C) 2012 Elsevier B.V. All rights reserved.
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