---
url: "https://questionstar.com/principles-of-survey-research/chapter-4/slide-131.html"
title: "Stratified Sampling"
type: "lehrbuch-slide"
chapter: 4
chapterTitle: "Sampling"
slide: 131
---

# Stratified Sampling

*The population is first divided into non-overlapping strata. Then a (dis-)proportional share is drawn at random from each stratum. Elements within a…*

1 10 12

2 4 6

7 8 11

3 5 9

→

Sample

2 10

The population is first divided into **non-overlapping strata** . Then a **(dis-)proportional** share is drawn at random from each stratum. Elements within a stratum should be **similar** to one another.

Good for

Highlighting a particular subgroup within the population Observing relationships between two or more subgroups Representative sampling of even the smallest and least accessible subgroups Higher statistical precision

Proportional

| Stratum | A | B | C |
|------|------|------|------|
| Population size | 100 | 200 | 300 |
| Sampling fraction | ½ | ½ | ½ |
| Sample size | 50 | 100 | 150 |

Disproportional

| Stratum | A | B | C |
|------|------|------|------|
| Population size | 100 | 200 | 300 |
| Sampling fraction | ⅕ | ½ | ⅓ |
| Sample size | 20 | 100 | 100 |

---

*Slide 131 of 274 · Chapter 4: Sampling · Principles of Survey Research · Dr. Paul Marx*