Arcsin transformations were made for gap fraction
by densiometer, both analyses of hemi-photos, and
PAR transmission to account for binomial data. The
performance of simple linear models of PAR transmission
using gap fraction from each technique were
compared under different conditions. Each model’s
R2-value, a measure of the method’s ability to explain
variations in PAR transmission, were assessed and
compared for all points and plot means for subsamples
of stands with contrasting characteristics.