Select the option that best describes your data.

Complete the following steps if the measurement data for a Moving Average chart are in one column.

- From the drop-down list, select All observations for a chart are in one column.
- Enter one or more columns of measurement data. If you enter more than one column, Minitab creates a separate Moving Average chart for each column.
- In Subgroup sizes, do one of the following:
- If all subgroups are the same size, you can enter the subgroup size (for example, 5).
- Enter a column of values that identifies which subgroup each measurement is from.

- In Length of MA, enter the length of the moving averages. The value that you enter is the number of subgroup means or the number of individual observations that are included in each moving average. If you have individual observations, Minitab uses them instead of the subgroup means in all calculations. With larger lengths, you increase the ability to detect smaller shifts in the process mean, but you also increase the amount of time it takes to signal that the shift occurred.

In this worksheet, Length contains the length of parts, and Subgroup contains the subgroup indicators.

C1 | C2 |
---|---|

Length | Subgroup |

0.65 | 1 |

0.69 | 1 |

0.67 | 1 |

0.67 | 1 |

0.62 | 2 |

0.59 | 2 |

0.59 | 2 |

0.60 | 2 |

Complete the following steps if each row in the worksheet contains the measurement data for one subgroup.

- From the drop-down list, select Observations for a subgroup are in one row of columns.
- Enter the columns that contain the measurement data.
- In Length of MA, enter the length of the moving averages. The value that you enter is the number of subgroup means or the number of individual observations that are included in each moving average. If you have individual observations, Minitab uses them instead of the subgroup means in all calculations. With larger lengths, you increase the ability to detect smaller shifts in the process mean, but you also increase the amount of time it takes to signal that the shift occurred.

In this worksheet, the data for subgroup 1 are in the first row across columns 1−4. The data for subgroup 2 are in the second row across columns 1−4.

C1 | C2 | C3 | C4 |
---|---|---|---|

Measurement 1 | Measurement 2 | Measurement 3 | Measurement 4 |

0.65 | 0.69 | 0.67 | 0.67 |

0.62 | 0.59 | 0.59 | 0.60 |