Estimation of GM (1, 1) model parameter usually adopts the least square criterion, but test of model precision often USES average relative error criterion.
估计GM(1,1)模型中的参数通常采用最小二乘准则，而在模型精度检验时又常采用平均相对误差。
Comparing with test data, the simulation model shows high precision, thus could be used to study the dynamic characteristic of high back pressure electricity-generating diesel engines.
通过与试验数据对比，该仿真模型具有较高的精度，可以用于研究高背压发电用柴油机在动态工况下的运行特性。
To assure the precision of evaluations and predictions, a good software reliability model should have the function of describing test coverage and can reflect the fault repair process.
为了保证可靠性模型的估测精度，好的软件可靠性模型应该包括对测试覆盖的说明，并且能够反映软件的错误修复过程。
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