After working as a wood scientist in Forest Research in the UK, I joined in 2007 the Department of wood and forest sciences at Laval University, Canada. My work is mainly dedicated to modelling the variability of wood properties at various scales. People in my research team work on several wood attributes such as cell wall properties, fibre dimensions, annual ring density, or knot formation, which can determine the suitablity of wood for specific end-uses.
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I would recommend that appropriate regression techniques are used instead of plotting simple linear trends. For example, in figure 2 your dependent variable is a number of observat...