Research Article

Surface Investigation of Photo-Degraded Wood by Colour Monitoring, Infrared Spectroscopy, and Hyperspectral Imaging

Table 5

Nonlinear regression analysis for the peak ratio at the different times of exposure in Solar Box of poplar samples.

ValueCoefficientDescriptionSignificanceTime coefficientSignificance adj.Significance

/ 1.383e coefficient***āˆ’0.005***0.865***
Regression / =

/ 2.808intercept***0.003*0.129*
Regression / =

Statistically significant.
Very high statistical significance.