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有人做过日内相对标准偏差和日间相对标准偏差不?就是intraday precision and inter-day precision,具体怎么做啊?日内标准偏差是一个样品一天测几次的标准偏差还是几个平行样品一天测几次的标准偏差?同理,日间标准偏差是一个样品连续测几天呢,还是几个平行样连续测几天?
ASTM D4966-10 Standard Test Method for Abrasion Resistance of Textile Fabrics (Martindale Abrasion Tester Method)
ASTM E398-03StandardTest Methods for Water Vapor Transmission Rate of Sheet Materials Using Dynamic Relative Humidity Measurement1[img]http://www.instrument.com.cn/bbs/images/affix.gif[/img][url=http://www.instrument.com.cn/bbs/download.asp?ID=140280]ASTM E398-03StandardTest Methods for Water Vapor Transmission Rate of Sheet Materials Using Dynamic Relative Humidity Measurement1[/url]