2.4 Calculations and statistical approaches We determined relative growth rates (RGRs) using a first order power-law model, which is especially suitable for the early stages of seedling growth when growth is rapid and non-asymptotic, but slowing over time (Paine et al., 2012). d h / d t = t β $$ \mathrm{d}h/\mathrm{d}t={t}^{\beta } $$ h/dt is the height increment over time (or RGR). To represent time in our models we used “relative month” where the warming treatment began at relative month = 0.
