2) Exple: Performance of companies (Y) after merger (X) 3) Predict: Next time, if X occurs, Y will follow
Now two companies merge, will they perform better in the future as one single company?
Proc reg data=test; model TP PRICE=BVPS EPS/adjrsq; BVPS: mtest TP-PRICE, BVPS/print; EPS: mtest TP-PRICE, EPS/print; run;
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实证假设检验-超越t值
Fama-MecBeth (1973) (cross-section, then timeseries):
White (1984) (cross-section, then time-series):
Z-Statistics=mean of t-Statistics/standard error of t-Statistics.
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实证假设检验-超越R2
Incremental Explanatory Power (IEP) and
2sls, 3sls; Mishkin tests: Sloan (1996), Xie (2001); Lead-Lag Analysis: Mean and non-parameter median tests; Principal Component Analysis:
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实证假设检验-超越SAS
断力,避免无意的抄袭。
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二、研究态度
眼高不能手低:千万不要一上来就想创造“惊天动地”的大学问, 这样的创新是没有的,必须扎扎实实地做;有人对研究目的、意义 说的很大,设想很好。可是内容与意义间缺乏必要联系,没有可行 性。