A pictograph represents categorical data with labeled categories and equal-sized symbols whose meaning is defined by a key; one symbol may stand for one item or a small whole-number group such as 2, 5, or 10 items. Creating one requires matching each category’s frequency to the correct number of symbols and preserving quantities for comparison, addition, and subtraction. Fractional symbols, changing scales, and generalized or large data sets are outside this scope.
A pictograph uses pictures or symbols to show how many items are in each category.
Example:
A class voted for its favorite fruit.
We will use this key:
Key: ● = 2 students
| Favorite fruit |
|---|
| Apples |
| Bananas |
| Oranges |
Since each symbol stands for 2 students:
Key: ● = 2 students
| Favorite fruit | Students |
|---|---|
| Apples | ● ● ● |
| Bananas | ● ● |
| Oranges | ● |
Check your work by counting the symbols and using the key:
The pictograph keeps the same quantities as the original data.
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