Individual Series
Class 11 Statistics — Unorganised vs Organised Individual Series, Arrays
What is a Statistical Series?
Series Classification (based on construction)
Individual Series
• Unorganised (Raw Data)
• Organised: By Serial Number / By Order of Magnitude (Array)
Discrete Series
Frequency Array
Continuous Series
Grouped Frequency Distribution
Unorganised vs Organised Individual Series
Raw data in its original form is confusing. Let’s see how organising it makes the picture clear.
Unorganised (Raw Data)
35
40
38
17
25
45
36
29
42
22
10 observations, no particular order
Organised
1.35
2.40
3.38
4.17
5.25
6.45
7.36
8.29
9.42
10.22
When to Use Individual Series
Individual series makes data relatively easier to understand. However, if there are a large number of observations (like 500 or 1,000), individual series becomes useless. In such cases, Discrete or Continuous frequency distributions are used.
Key Takeaways
Key Takeaways
- A statistical series arranges classified data in logical order (by size, time, or characteristics).
- Individual series can be unorganised (raw data) or organised (by serial number or by magnitude as an array).
- An array is data arranged in ascending or descending order, making it easy to spot the smallest and largest values.
- Individual series is practical for small datasets but becomes useless for large datasets (500+ observations).
- For large datasets, use discrete series (frequency array) or continuous series (grouped frequency distribution).