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Methods of Classification

4.2 Methods of Classification — Explore Geographical, Chronological, Qualitative (Simple & Manifold), and Quantitative classification methods. CBSE Class 11 Statistics notes with interactive classification explorer.

Notes

Methods of Classification

Class 11 Statistics — Geographical, Chronological, Qualitative, and Quantitative Classification

Four Methods of Classification

Data can be classified in four different ways depending on what feature we use as the basis for grouping.

Geographical

Classified by location or region

Data classified according to geographical location or region (countries, states, districts).

StatePopulation (2011)
Andhra Pradesh84,665
Tamil Nadu72,138
Rajasthan68,621
Karnataka61,130
Gujarat60,383

Used when: Presenting population, production, or any variable across regions.

Chronological

Classified by time period

Data classified with respect to different periods of time (decades, years, months), arranged in ascending or descending order.

YearPopulation (Delhi, '000)
19511,744
19612,659
19714,066
19816,220
19919,421
200113,851
201116,753

Used when: Studying trends, growth, or change over time.

Qualitative

Classified by attributes

Data classified on the basis of descriptive characteristics / attributes (sex, literacy, region, caste, education) that cannot be quantified.

Simple Classification

Two classes based on one attribute only. Example: population divided into Males and Females.

Manifold Classification

More than one attribute, or each class sub-divided into more than two sub-classes. Example: population ? male/female ? literate/illiterate ? married/unmarried.

Used when: Studying attributes, opinions, categorical data.

Quantitative

Classified by measurable values

Data classified on the basis of measurable characteristics (height, weight, income, production). Involves two elements: Variable (characteristic) and Frequency (number of observations).

Age GroupNo. of Students
10–12150
12–14130
14–16100
16–18120

Used when: Dealing with numerical data that can be measured.

Qualitative Classification — Deep Dive

Qualitative classification has two subtypes. Click each branch to explore.

Qualitative Classification

Simple Classification

Facts classified into two classes according to one attribute only. Always creates exactly 2 groups (dichotomous).

Example:

Population of a city divided into Males and Females.

Manifold Classification

Facts classified according to more than one attribute. Each class is sub-divided into more than two sub-classes, creating a hierarchy of classes.

Example:

Population ? Males/Females ? Literates/Illiterates ? Married/Unmarried

Key Takeaways

Key Takeaways

  • Geographical classification groups data by location (states, countries, regions).
  • Chronological classification arranges data by time periods to study trends and growth.
  • Qualitative classification groups by non-measurable attributes (sex, literacy, caste) — can be simple (2 classes) or manifold (hierarchy).
  • Quantitative classification groups by measurable characteristics (height, income, age) using variables and frequencies.
  • The same dataset can often be classified in multiple ways depending on what question you want to answer.