On the Data tab of the U Chart dialog box, complete the following steps to specify the data to analyze.
- In Number of defects per unit column, enter the column that contains the process data. Each row contains the number of defects for one subgroup.
- From the drop-down list, do one of the following:
- If all subgroups are the same size, choose All subgroups are the same size. In Subgroup size, enter the subgroup size (for example, 5).
- If you have a column of subgroup sizes, choose Subgroup sizes are in a column. In Subgroup sizes column, enter the column of subgroup sizes.
In this worksheet, the Irregularities column contains the number of defects, such as tears and pulls, that were found in each subgroup. The Yards Sampled column indicates the size of the subgroup. For example, row 1 indicates that 10 irregularities were found in 120 yards of fabric.