Every model includes exogenous and also endogenous variables which must be estimated. 每一个模型都包括需要估计的外生变量和内生变量。
Audit risk modeling converts audit risk that is disordered and exogenous into an endogenesis variable that can be controlled by auditors. 摘要审计风险模型化将外生的零散化的审计风险转化为易为审计师控制的内生变量，通过对内生变量的控制实现外生变量的目标。
