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Table 4 Test statistics, P values, and degrees of freedom (df) for fuel consumption by fuel type from a randomized complete block repeated measures analysis for 5-year interval reburns for the season and frequency of burn study in the Blue Mountain Ecoregion, Oregon, USA. Values for significant effects α = 0.05 are marked with an asterisk (*). df is the degrees of freedom for which the first number is the numerator and the second number is the denominator to compute the P value.

From: Long-Term Effects of Burn Season and Frequency on Ponderosa Pine Forest Fuels and Seedlings

  Year Treatmenta Year × treatment
Fuel type F P df F P df F P df
1 hr 0.16 0.851 2, 11.8 0.03 0.876 1, 4.3 0.89 0.436 2, 11.8
10 hr 9.32 0.003* 2, 13.8 21.85 0.008* 1, 4.4 0.11 0.898 2, 13.8
100 hr 20.49 ≤0.001* 2, 6.8 4.76 0.057 1, 9.0 10.08 0.009* 2, 6.8
1000 hr 1.04 0.377 2, 15.2 0.65 0.439 1, 10.5 0.42 0.661 2, 15.2
Forest floorb 0.46 0.639 2, 12.7 16.61 0.010* 2, 4.9 4.45 0.034* 2, 12.7
  1. a Fall or spring reburn
  2. b Litter and duff combined depth (cm)