This is because models which depend linearly on their unknown parameters are easier to fit than models which are non-linearly related to their parameters and because the statistical properties of the resulting estimators are easier to determine.
这是因为线性依赖于其未知参数的模型比非线性依赖于其未知参数的模型更容易拟合，而且产生的估计的统计特性也更容易确定。