RIDPPM means received incoming－material defective pieces per million
FDPPM means factory defected pieces per million
LAR=(number of incoming lots passed / number of incoming lots checked）×100％
RIDPPM=(（Number of incoming seriously unqualified devices＋0.3×number of incoming slightly unqualified devices） / number of incoming devices checked)×1000000
FDPPM=( number of devices defected / number of devices used）×1000000
LAR＝(Qualified lots / checked lots)×100％
RIDPPM＝（（Severely unqualified +0.3×slightly unqualified）/sample））×1000000
FIDPPM＝（Unqualified products in use / all products in use）×1000000
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wenhua517 (威望:0) (广东 东莞) 在校学生 员工
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FDPPM means factory defected pieces per million
LAR=(number of incoming lots passed / number of incoming lots checked）×100％
RIDPPM=(（Number of incoming seriously unqualified devices＋0.3×number of incoming slightly unqualified devices） / number of incoming devices checked)×1000000
FDPPM=( number of devices defected / number of devices used）×1000000
LAR＝(Qualified lots / checked lots)×100％
RIDPPM＝（（Severely unqualified +0.3×slightly unqualified）/sample））×1000000
FIDPPM＝（Unqualified products in use / all products in use）×1000000
LAR＝（抽樣合格批/抽樣檢驗批）×100％
RIDPPM＝（（嚴重不合格品數+0.3×輕微不合格品數）/檢驗數））×1000000
FIDPPM＝（使用中的來料不合格品數/使用數）×1000000
DPPM一層含義是：Defective Pieces Per Million，個人認為此種解釋適合于統計不合格品之DPPM。
DPPM另外的意思是：Defective Parts Per Million，個人認為此種解釋適合于統計缺陷點之DPPM。