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