OFFICIAL STATISTICS SPECIALLY DESIGNED FOR INDIAN STATISTICAL SERVICE (ISS) AND OTHER GOVERNMENT & PRIVATE SECTOR STATISTICAL EXAMINATIONS
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Migration is a population process involving movement between locations under a defined statistical criterion. Measurement depends strongly on the definition of migration, duration, usual residence and the reference place. These concepts make migration statistics a valuable ISS examination topic.
1. What is migration?
Migration statistics classify movement of persons between geographic areas according to a specified statistical definition. The definition may depend on duration, change of residence or other criteria.
2. Origin and destination
Every migration observation involves a place of origin and a destination. Geographic coding must be consistent to support regional comparisons.
3. Duration and usual residence
Short-term movement, long-term migration and usual residence can produce different counts. A statistical answer should therefore state the reference criterion.
4. Sources of migration data
Censuses, sample surveys and administrative records can provide migration information. Each source has different strengths in coverage, frequency, detail and timeliness.
5. Migration rates
Migration can be expressed as counts, rates or shares. The denominator must be defined before comparing areas or periods.
6. Measurement challenges
Circular movement, seasonal migration, multiple moves, incomplete records and recall problems can complicate measurement. Harmonised concepts are essential for comparability.
Migrant
A person meeting the specified movement/residence criterion.
Origin
The geographic area from which the movement is measured.
Destination
The geographic area to which the movement is measured.
ISS Exam Focus
For official-statistics questions, always define the statistical unit, reference period, coverage, numerator and denominator. Distinguish counts, rates, ratios, stocks and flows before interpreting a number.
Exam tip
In numerical questions, write the formula first, substitute values second and finish with the correct unit. In descriptive questions, structure the answer around definition, methodology, data source, quality and interpretation.
Three important questions on this topic
Try each one on your own first, then tap the answer.
Why must migration statistics specify a duration criterion?
Show answer
Because different duration rules can classify the same movement differently and therefore produce different migrant counts.
An area records 12,000 in-migrants in a population of 600,000. Find the in-migration rate per 1,000 population.
Show answer
12,000/600,000 × 1,000 = 20 per 1,000 population.
Discuss the challenges of measuring internal migration in India.
Show answer
Explain definitions, usual residence, duration, seasonal and circular migration, source differences, under-reporting, geographic coding and the need for comparable denominators.
Key takeaways
- Definitions and statistical units determine what an official statistic actually measures.
- Coverage, reference period and denominator are essential for meaningful comparison.
- Administrative records, surveys and census-type operations have different strengths and limitations.
- Always separate a statistical observation from an explanation or causal interpretation.
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- Indian official statistical system: MoSPI, NSO, NSC and the data they produce
- National accounts, GDP, IIP, price indices and labour statistics
- NSS surveys, sampling designs and data quality concepts
- Written specially for the ISS exam, and useful for other government and private sector statistical exams
- Concept-focused notes to revise quickly before the exam
Official Statistics for ISS and other Government & Private Sector Statistical Examinations