这好像是我答复的第三帖了.谢谢楼主的赏识.

　　ForthePEFRdatas=38.8.Thestandarderrorofdisthus9.4,对于PEFR（呼气流速变化率）数据s＝38.8来说,那d的标准误差因此为9.4.Forthe95%confidenceintervalwehave16degreesoffreedomandt=2.12.对于95％的置信区间来说,我们有16的自由度,而t＝2.12.Hencethe95%confidenceintervalforthebiasis-2.1-(2.12´9.4)to-2.1+(2.12´9.4),giving-22.0to17.8l/min.因此,对于偏差95％的置信区间为-2.1-(2.12´9.4)to-2.1+(2.12´9.4）,给出为-22.0to17.8l/min.Thestandarderrorofthelimitd-2sis16.3l/min.极限d－2s的标准误差为16.3l/min.The95%confidenceintervalforthelowerlimitofagreementis-79.7-(2.12´16.3)to-79.7+(2.12´16.3),giving-114.3to

　　-45.1l/min.对于协议下限的95％的置信区间为-79.7-(2.12´16.3)to-79.7+(2.12´16.3),给出为-114.3to

　　-45.1l/min.Fortheupperlimitofagreementthe95%confidenceintervalis40.9to110.1l/min.对于协议的上限,95％的置信区间为40.9to110.1l/min.Theseintervalsarewide,reflectingthesmallsamplesizeandthegreatvariationofthedifferences.这些区间比较宽,反映了较小的样本量和差别的巨大变化.Theyshow,however,thatevenonthemostoptimisticinterpretationtherecanbeconsiderablediscrepanciesbetweenthetwometersandthatthedegreeofagreementisnotacceptable.可是它们表明了,即使是在最乐观的解释下,两台仪表之间都可能存在相当大的差异,而且符合程度不能让人接受