方法采取整群抽样方法，抽取某省级医院1994年至2 0 0 0年伤害病人病案，进行平均住院日、平均住院费用趋势性分析。
Methods Cluster sampling was taken, and average hospitalization days and average medical cost of injury patients from 1994 to 2000 were conducted by trend analysis.
通过在粗略/概要性的可用内存统计信息中查找下降趋势来分析周期。
Periods are analyzed by looking for downward trends in the approximated/summarized free memory statistics.
虽然此类信息能够使人们对疾病的严重性和重要性有一定认识，并了解某些一段时间内疾病发展趋势方面的信息，但不足以开展详细的流行病学分析。
While such information can give an impression of the severity and importance of diseases and tell us something about trends over time, it is insufficient for detailed epidemiological analysis.
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