请问下这两段话怎么翻译

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This study finds no relationship (a strong relationship) between ex post forecast accuracy (investor sophistication) and the degree to which the consensus analyst earnings forecast outperforms forecasts from seasonal random walk time-series models as proxies for the market's earnings expectations.  Analyst forecast errors are value relevant for Japanese securities, but less so than management forecast revisions from prior consensus forecasts. The value relevance of management forecasts was greater after the Tokyo Exchange bubble of the late 1980s.

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关键词：relationship Expectations OUTPERFORMS expectation time-series

此研究发现基于过去经济发展情型（ex post）的预测准确性（投资者的复杂性）和舆论分析者对盈余的预测成果的贝叶斯模型（outperforms）预测之间并无相关关系，预测来自来自季节性随机游动时间序列模型，作为市场盈余期望的代理。分析者的预测错误是和日本证券价值相关的，但是其相关性比来自曾经的舆论预测管理预测修正要小。

大概是这样吧，我也不是很清楚，希望对你有帮助啦，有点小疑惑，这段文字复制粘贴的过程里是不是遗漏了标点？有的句子好像结构不太对~