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In this paper, the pith quantiles of samples on parameter estimation were applied to geometric-Gumbel compound extreme-value distribution. The asymptotic normal estimation of distribution parameter and scale parameter was proposed by linear regression model, based on k pith quantiles of extreme-value distribution simple sample. The asymptotic confidence interval was given for extreme-value distribution. Then, the effect was evaluated by numerical simulation, the result was good.

No abstract

Wheat aphid, Sitobion avenae F. is main aphid species infesting winter wheat in the filling stage in Northwest China, and it has severe impact on both wheat yield and quality. The study acquired hyperspectral data by ASD FieldSpec Pro spectrometer at the canopy level and aphid damage levels of samples in the filling stage of winter wheat. The spectral characteristics of wheat