The empirical data were 171 samples collected from a survey conducted in March 1993.The statistical instruments utilized include t-test, F-test, a PROBIT analysis and the generalized linear model.

• 实证资料来源系1993年初对171家厂商问卷访查之回收样本，分析方法主要采用均值差异性分析（T值检定）、变异数分析（F值检定）和PROBIT分析。