Economics · Ch 13 — Organisation of Data
Frequency Array
13.5.13
Frequency Array
Everything so far grouped a continuous variable into class intervals. For a discrete variable the corresponding arrangement is a frequency array. Because a discrete variable takes only whole (integral) values and none of the fractions between them, there is no need for class intervals — a frequency is attached directly to each individual value.
For example, the size of households (a discrete variable, since a household has a whole number of members):
Table Table 3.8Table 3.8 Frequency Array of the Size of Households
| Size of the Household | Number of Households |
|---|---|
| 1 | 5 |
| 2 | 15 |
| 3 | 25 |
| 4 | 35 |
| 5 | 10 |
| 6 | 5 |
| 7 | 3 |
…