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. Author manuscript; available in PMC: 2015 Dec 31.
Published in final edited form as: Ann Occup Hyg. 2014 Dec 2;59(3):336–346. doi: 10.1093/annhyg/meu096

Table 2.

Calibration parameters from forced-zero, linear fitting (y = ax) for red oak in Kubelka–Munk units and quadratic fitting (y = ax + bx2) for red oak, southern yellow pine and western red cedar in log (1/R) units. R2 is the coefficient of determination for the regression analysis (not the square of reflectance)

Standards NIOSH
 Tulane University
a b R 2 a b R 2
Red oak 0.352 — 0.960 (K–M) 0.406 — 0.983 (K–M)
0.368 −0.045 0.999 (log 1/R) — — —
Southern yellow pine 0.171 −0.019 0.997 (log 1/R) 0.162 −0.021 0.998 (log 1/R)
Western red cedar 0.166 −0.018 0.997 (log 1/R) 0.165 −0.022 0.998 (log 1/R)