Research on Revenue Insurance Premium Ratemaking of Jujube Based on Copula-Stochastic Optimization Model

Table 1

Z-score normalized data of fluctuation items in yield per unit area and price of jujube in Aksu region.

Time/year	2002	2003	2004	2005	2006	2007	2008	2009	2010
Yield per unit area	0.9209	−1.2248	−0.7132	−0.4427	2.96	−1.1104	−1.0053	−0.3387	0.8537
Price	−1.4635	2.3301	−0.9486	0.3199	−0.3625	0.2797	−0.2522	−0.9188	1.5111
Time/year	2011	2012	2013	2014	2015	2016	2017	2018	—
Yield per unit area	0.6656	−0.5131	0.1116	−0.3877	−0.2682	−0.0334	0.1674	0.3584	—
Price	−0.0232	0.1822	−1.1625	−0.3641	1.4938	−0.0033	−0.5163	−0.1018	—