This monthly look at the best-performing biotechnology, drug and medical device stocks is based on data from FactSet Systems.

这个月度的调查着眼于表现最佳的生物科技、制药和医疗设备类股票，以FactSet Systems的数据为基础。

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But on Friday, both stocks and the dollar rallied following the stunning improvement in US employment data.

但上周五，美国就业数据出现惊人改善的消息公布之后，股市和美元双双走高。

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Although mutual funds data is only updated once a day and can be cached, the stocks data keeps on changing.

虽然公共基金数据每天只更新一次可以缓存，但是股票数据一直在改变。

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For instance, reporters could see if subscribers had been looking at top news stories, or if they had been gathering data on stocks or bonds, but not which stories or bonds and stocks they had looked up, according to Bloomberg LP spokesman Ty Trippet.

WSJ: Bloomberg editor apologizes on information access

Although good data on preferred stocks is not generally available for free on popular investing websites like Yahoo!

FORBES: Forget The Dogs, For Rich Income Look To Dow Preferreds

If you want trading data and (where available) financial data on unlisted stocks, a good resource is OTC Markets, the successor to the old Pink Sheets and a trading platform for 9, 973 issues.

FORBES: O-T-C Trading for Experienced Investors