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Table 2 Results of binomial logistic regression analysis of factors affecting proportion of total fruits allocated to SRE

From: Secondary reproduction in the herbaceous monocarp Lobelia inflata: time-constrained primary reproduction does not result in increased deferral of reproductive effort

Term Parameter estimate (±SE) Wald chi-square statistic df p Estimated odds ratio
Constant −4.88 (0.20) 589.81 1 <0.001* -
Year = 2008 −0.40 (0.32) 1.51 1 0.22 0.67
Year = 2009 0.18 (0.23) 0.61 1 0.44 1.19
Year = 2010 0 - - - 1.00
Bolting month = June 3.35 (0.17) 389.09 1 <0.001* 28.50
Bolting month = July 2.96 (0.17) 300.49 1 <0.001* 19.30
Bolting month = August 1.71 (0.18) 87.45 1 <0.001* 5.52
Bolting month = September 0 - - - 1.00
Size 0.02 (0.00) 0.37 1 0.54 1.01
  1. The four bolting groups were experimentally produced using a photoperiod manipulation, and this manipulation was repeated for three years from 2008-10. Prebolting plant size was measured as the length (in mm) of the longest living leaf of the unbolted rosette. The regression model is a significant predictor of the response (χ2 = 2200.57, df = 32, p < 0.005). Odds ratios express relative likelihood of fruit being allocated to the SRE.
  2. *p < 0.05.