《Table 3 The error matrix of GlobeLand30(2010)sampling results》

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《基于景观形状指数抽样的GlobeLand30（2010）中国区精度验证》

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（4）Kappa coefficient:this is a statistic that measures the inter-rater agreement for qualitative（categorical）items.It is generally thought to be a more robust measure than a simple percentage agreement calculation，because it takes into account the possibility of the agreement occurring by chance.The range of the Kappa coefficient is from 0 to 1，and the larger the value，the greater the reliability of the result.