In the following worksheet, the two grouping variables Style and Size each have three values. However, some data are missing.
C1-T | C2-T | C3 |
---|---|---|
Style | Size | Quantity |
Short | Small | 4 |
Short | Medium | 6 |
Short | Large | 3 |
Long | Small | 3 |
Long | Medium | 7 |
Long | Large | 2 |
Small | 5 | |
Hooded | Small | 1 |
Hooded | Medium | 4 |
C1-T | C2 |
---|---|
Group | Data |
A | 22 |
30 | |
B | 47 |
25 | |
... | ... |
C1-T | C2 | C3 |
---|---|---|
Group | Subgroup | Data |
A | 1 | 55 |
B | 1 | 41 |
B | 2 | 29 |
C | 1 | 44 |
C | 2 | 33 |
The following examples graph data from the previous worksheet to show all possible combinations.
If you deselect both Include missing as a group and Include empty cells, Minitab excludes the group Hooded/Large and the group created by a missing value and Small.
If you select only Include missing as a group, Minitab includes a bar for the "missing group" formed by an empty cell and the value Small.
If you select Include empty cells, Minitab includes an empty placeholder for the group Hooded/Large.
If you check both Include missing as a group and Include empty cells (the defaults), Minitab includes both empty cell and missing groups from the earlier examples, as well as the empty cells created by their combination (a missing value with "Medium" and a missing value with "Large"). When used in the context of paneling, these options have a similar effect on the number of panels.