A note on the analysis of germination data from complex experimental designs

Publikation: Bidrag til tidsskriftLetterForskningfagfællebedømt

Signe Marie Jensen, Christian Andreasen, Jens Carl Streibig, Eshagh Keshtkar, Christian Ritz

In recent years germination experiments have become more and more complex. Typically, they are replicated in time as independent runs and at each time point they involve hierarchical, often factorial experimental designs, which are now commonly analysed by means of linear mixed models. However, in order to characterize germination in response to time elapsed, specific event-time models are needed and mixed model extensions of these models are not readily available, neither in theory nor in practice. As a practical workaround we propose a two-step approach that combines and weighs together results from event-time models fitted separately to data from each germination test by means of meta-analytic random effects models. We show that this approach provides a more appropriate appreciation of the sources of variation in hierarchically structured germination experiments as both between- and within-experiment variation may be recovered from the data.

OriginalsprogEngelsk
TidsskriftSeed Science Research
Vol/bind27
Udgave nummer4
Sider (fra-til)321-327
Antal sider7
ISSN0960-2585
DOI
StatusUdgivet - dec. 2017

Bibliografisk note

CURIS 2017 NEXS 290

ID: 185180122