The expected number of parts per million that have measurements less than the lower specification limit is calculated as follows:

PPM < LSL = 1,000,000 * F(LSL)

Term | Description |
---|---|

F(X) | The cumulative distribution function (CDF) of the distribution used in the analysis based on estimated or specified parameters |

PPM | Parts per million |

LSL | Lower specification limit |

The expected number of parts per million that have measurements greater than the upper specification limit is calculated as follows:

PPM > USL = 1,000,000 * (1 – F(USL))

Term | Description |
---|---|

F(X) | The cumulative distribution function (CDF) of the distribution used in the analysis based on estimated or specified parameters |

PPM | Parts per million |

USL | Upper specification limit |

The expected number of parts per million that are outside of the specification limits is calculated as follows:

PPM Total (Exp. Overall) = PPM < LSL (Exp. Overall) + PPM > USL(Exp. Overall)

PPM Total (Exp. Overall) = [1,000,000 * F(LSL)]+ [1,000,000 * (1 – F(USL))]

Term | Description |
---|---|

F(X) | The cumulative distribution function (CDF) of the distribution used in the analysis based on estimated or specified parameters |

LSL | Lower specification limit |

USL | Upper specification limit |

PPM | Parts per million |