Fire Ecology

Table 3 F-values and degrees of freedom (df; numerator,denominator) from repeated measures analysis of variance of zone (Z), year (Y; categorical), and their interactive (Z × Y) effects on the proportion of acceptable prescribed fire days within each half-season and on the total number of acceptable days annually from 2003 to 2015 for the Bismarck and Grand Forks fire weather zones that cover North Dakota and Minnesota, USA (Fig. 1)

From: Seasonality of prescribed fire weather windows and predicted fire behavior in the northern Great Plains, USA

Variable	Dates	df	Zone	df	Year	df	Z × Y
Total days		1,19	5.25*	12,129	2.41**	11,127	1.26
Early spring	21 Mar to 5 May	1,19.2	6.27*	12,128	7.89***	11,127	2.44**
Late spring	6 May to 20 June	1,19.2	3.01^†	12,129	3.20***	11,128	2.16*
Early summer	21 Jun to 6 Aug	1,19.1	6.88*	12,132	1.70^†	11,130	0.75
Late summer	7 Aug to 21 Sept	1,20	9.29**	12,131	4.78***	11,129	1.18
Early fall	22 Sep to 6 Nov	1,19.1	3.85^†	12,128	9.70***	11,126	2.31*

*P < 0.05,
**P < 0.01,
***P < 0.001,
^†P < 0.10

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