求翻译：1995 年，对于非上市公司，Altman对Z 模型进行了修改，得到Z′计分模型。Altman、Haldeman 和Narayannan在1977 年对原始的Z 计分模型进行扩展，建立的第二代的ZETA 信用风险模型。该模型在公司破产前5 年即可有效划分出将要破产的公司，其中破产前1 年准确度大于90 % ，破产前5 年的准确度大于70 %。是什么意思？

In 1995, for non-listed companies, Altman z model was modified to obtain z 'scoring model. Altman, haldeman and narayannan 1977 on the original z-score model expansion, the establishment of the second generation of the zeta credit risk models. Five years before the company went bankrupt, the model c

In 1995, for non-listed companies, Altman Z model to have been modified to be Z condition scoring model. , Altman Narayannan Haldeman and in 1977 the original Z scoring model for expansion and the establishment of the generation 2 ZETA credit risk models. The model in the company 5 years prior to in

In 1995, regarding the non-to be listed, Altman has carried on the revision to the Z model, obtains Z ' the scoring model.Altman, Haldeman and Narayannan carried on the expansion in 1977 to the primitive Z scoring model, the establishment second generation of ZETA credit risk model.Before this model

In 1995, for the non-listed company, Altman z-model has been modified, scoring models be z '. Altman, Narayannan and Haldeman in 1977 on the original z-score scale models, establishing second generation credit risk model of ZETA. 5 years prior to the bankruptcy of the model can be effectively divide

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