OFFICIAL STATISTICS SPECIALLY DESIGNED FOR INDIAN STATISTICAL SERVICE (ISS) AND OTHER GOVERNMENT & PRIVATE SECTOR STATISTICAL EXAMINATIONS
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The Periodic Labour Force Survey (PLFS) is a central source of official labour-market statistics in India. For ISS aspirants, PLFS is important because questions often test the definitions and relationships among Labour Force Participation Rate (LFPR), Worker Population Ratio (WPR), Unemployment Rate (UR), usual status and current weekly status.
1. What is PLFS?
PLFS provides regular statistics on labour-force participation, employment and unemployment. It is conducted by the National Statistics Office under MoSPI and is designed to generate labour-market indicators for different population groups and geographical areas.
Core exam idea
PLFS questions are frequently definition-based. A student can lose marks by knowing the formula but using the wrong population or status concept.
2. LFPR, WPR and UR
The three basic indicators can be written as:
WPR = Workers / Population × 100
UR = Unemployed Persons / Labour Force × 100
LFPR
Share of population that is in the labour force.
WPR
Share of population that is employed as workers.
UR
Share of the labour force that is unemployed.
3. Why the denominator matters
UR uses the labour force as the denominator, whereas LFPR and WPR use the relevant population. Therefore, a fall in unemployment does not automatically mean that employment increased; people may also leave the labour force.
Exam tip
Always write the denominator when answering a rate-definition question. It makes the distinction between LFPR, WPR and UR immediately clear.
4. Usual status and current weekly status
PLFS uses different reference-period concepts for measuring labour-market activity. Usual status uses a longer reference period and captures a person's predominant activity status, while current weekly status uses the week preceding the survey date as the reference period.
The choice of status can affect the measured employment and unemployment rates, so an ISS answer should identify the reference period explicitly.
5. Reading PLFS tables correctly
Official PLFS tables can be cross-classified by rural/urban residence, sex, age group and State/UT. For example, the Annual PLFS 2025 publication reports unemployment rates by rural and urban sectors and by sex. When comparing figures, specify the year, status approach, age group and population before drawing a conclusion.
6. Common mistakes students make
- Using population instead of labour force as the denominator for UR.
- Assuming every unemployed person is outside the labour force.
- Ignoring the reference period when comparing usual status and current weekly status.
- Comparing two rates without checking age group, sex, rural/urban coverage and reference year.
7. Three important questions
Try each one on your own first, then tap the answer.
Define LFPR, WPR and unemployment rate.
Show answer
LFPR = labour force as a percentage of population; WPR = workers as a percentage of population; UR = unemployed persons as a percentage of the labour force.
In a population of 1,000, 600 persons are in the labour force and 570 are employed. Calculate LFPR, WPR and UR.
Show answer
LFPR = 600/1000 × 100 = 60%. WPR = 570/1000 × 100 = 57%. Unemployed = 600−570 = 30, so UR = 30/600 × 100 = 5%.
Explain why the reference period and denominator are important when interpreting PLFS labour indicators.
Show answer
Define the indicators first, then explain the population denominator for LFPR/WPR and labour-force denominator for UR. Distinguish usual status from current weekly status and state the exact reference period before comparing estimates.
Key takeaways
- Know the definition, coverage and official source of the indicator before memorising numbers.
- Separate an index level from its percentage growth or inflation rate.
- Read the reference year, population, classification and weights carefully in numerical questions.
- For current-affairs-linked questions, verify the latest official MoSPI or Government of India release before the examination.
Everything on Official Statistics, in one book
This topic is one part of the wider Official Statistics syllabus. The book brings the major concepts together for systematic ISS preparation.
- 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