Table 2 Error matrix showing number of bigcone Douglas-fir sites within and outside mapped perimeters that recorded a fire year, using fire scars, growth changes and a combination of both indicators as evidence in Los Padres National Forest. Overall accuracy was determined by dividing the number of correct outcomes by the total number of possible outcomes. Type I errors occur when evidence of fire is present outside a mapped perimeter, while Type II errors occur when evidence of fire is absent within a mapped perimeter.
From: Using Bigcone Douglas-Fir Fire Scars and Tree Rings to Reconstruct Interior Chaparral Fire History
Method | Presence/Absence | No. of sites inside mapped perimeter | No. of sites outside mapped perimeter | Overall accuracy (%) | Type I error (%) | Type II error (%) |
|---|---|---|---|---|---|---|
Fire scars only | Fire scar present | 25 | 2 | 90.8 | 1.6 | 7.5 |
Fire scar absent | 9 | 84 | ||||
Growth changes only | Change present | 21 | 11 | 80.0 | 9.2 | 10.8 |
Change absent | 13 | 75 | ||||
Scars & growth changes | Fire event present | 28 | 11 | 85.8 | 9.2 | 5.0 |
Fire event absent | 6 | 75 |