Indian Statistical Service (ISS) 2026 – Complete Syllabus

ISS 2026

Union Public Service CommissionPost Graduate hard

The ISS 2026 written examination comprises six papers: two general papers shared with IES and four Statistics-specific papers. Below is the full subject-wise syllabus.

ISS Papers Overview

PaperSubjectMax Marks
Paper IGeneral English100
Paper IIGeneral Studies100
Paper IIIStatistics I (Probability)200
Paper IVStatistics II (Statistical Methods)200
Paper VStatistics III (Sampling & Econometrics)200
Paper VIStatistics IV (Applied Statistics)200

Paper III – Statistics I (Probability)

  • Probability Theory: Axioms, Conditional Probability, Bayes' Theorem
  • Random Variables: Discrete and Continuous, Expectation, Variance
  • Standard Distributions: Binomial, Poisson, Normal, Exponential, Beta, Gamma
  • Functions of Random Variables, Moment Generating Functions
  • Law of Large Numbers, Central Limit Theorem

Paper IV – Statistics II (Statistical Methods)

  • Descriptive Statistics: Measures of location, dispersion, skewness, kurtosis
  • Correlation and Regression Analysis
  • Multivariate Analysis: Multiple Regression, Discriminant Analysis, Factor Analysis, Cluster Analysis
  • Non-Parametric Tests: Sign Test, Wilcoxon, Mann-Whitney, Kruskal-Wallis
  • Statistical Quality Control: Control Charts (X̄, R, p, c charts), Acceptance Sampling

Paper V – Statistics III (Sampling & Econometrics)

  • Sampling Theory: Simple Random Sampling, Stratified, Systematic, Cluster, PPS, Double Sampling
  • Design of Experiments: CRD, RBD, LSD, Factorial Designs, ANOVA
  • Econometrics: OLS, Violations (Heteroscedasticity, Autocorrelation, Multicollinearity), Simultaneous Equations

Paper VI – Statistics IV (Applied Statistics)

  • Time Series Analysis: Trend, Seasonality, Cyclical, Spectral Analysis
  • Index Numbers: Price indices, Laspeyres, Paasche, Fisher's Ideal Index
  • Vital Statistics: Fertility, Mortality, Life Tables, Population Growth Models
  • Survey Methodology: Survey design, Questionnaire framing, Data quality, Non-response
  • Official Statistics: NSO surveys, Census methodology, PLFS, CPI, WPI, NAS

Frequently Asked Questions

Q.How should I start the ISS 2026 syllabus preparation?

Start by downloading the official syllabus and splitting it into weekly targets. Build fundamentals first, then move to answer writing or objective practice based on the paper pattern.

Q.Does ISS 2026 require topic-wise revision cycles?

Yes. Keep at least 2-3 revision cycles for high-weightage topics. Revision with PYQs and mock tests improves retention and score stability.

Q.Are previous year questions enough for ISS 2026 syllabus coverage?

PYQs are essential for understanding demand, but they are not enough alone. Combine PYQs with standard books, current updates, and targeted practice.

Q.How many months are usually needed to cover the ISS 2026 syllabus?

Preparation duration depends on your baseline, but most candidates plan 4-8 months with disciplined study, revision, and test practice.

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