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九、样本选择和研究设计本文的研究目标和时间跨度为选取样本设定了准则。那些入选的获证企业应满足如下两条准则:1)在1997年1月以前通过认证:2)在整个研究时间跨度内一直在土耳其伊斯坦布尔证券交易所(ISE)上市。对于未获证企业,入选研究样本的必要条件是在全部研究时段内都在 ISE 上市。这种样本选取准则的设定对于研究 ISO 9000认证的长期影响非常重要。此外,被选中的研究样本应属于前述的7个主要的制造行业类别,其他行业的公司暂不列入研究范围,以避免任何潜在的数据不一致性。
Nine, sample selection and research design The research objectives and time span of this article set the guidelines for the selection of samples. Those selected certified companies should meet the following two criteria: 1) Certified prior to January 1997: 2) Listed on the Istanbul Stock Exchange (ISE) throughout the study period. For unlicensed businesses, the requisite for inclusion in the study sample is to be listed on ISE for all study periods. The setting of this sample selection criterion is very important for studying the long-term impact of ISO 9000 certification. In addition, the selected research sample should belong to the aforementioned seven major manufacturing industry categories, and other industries are not included in the scope of the study in order to avoid any potential data inconsistency.