How to Use Stratified Sampling

### Author Topic: How to Use Stratified Sampling  (Read 288 times)

#### tanzina_diu

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##### How to Use Stratified Sampling
« on: March 27, 2016, 05:00:56 PM »
In stratified sampling, the population is partitioned into non-overlapping groups, called strata and a sample is selected by some design within each stratum.

For example, geographical regions can be stratified into similar regions by means of some known variable such as habitat type, elevation or soil type. Another example might be to determine the proportions of defective products being assembled in a factory. In this case sampling may be stratified by production lines, factory, etc.

Can you think of a couple additional examples where stratified sampling would make sense? Look for opportunities when the measurements within the strata are more homogeneous.

The principal reasons for using stratified random sampling rather than simple random sampling include:

1. Stratification may produce a smaller error of estimation than would be produced by a simple random sample of the same size. This        result is particularly true if measurements within strata are very homogeneous.
2. The cost per observation in the survey may be reduced by stratification of the population elements into convenient groupings.
3. Estimates of population parameters may be desired for subgroups of the population. These subgroups should then be identified.
Tanzina Hossain
Assistant Professor

#### munna99185

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##### Re: How to Use Stratified Sampling
« Reply #1 on: April 13, 2016, 10:25:23 AM »
Informative post.

Sayed Farrukh Ahmed
Assistant Professor
Daffodil International University

#### Nusrat Nargis

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##### Re: How to Use Stratified Sampling
« Reply #2 on: April 18, 2016, 04:27:43 PM »
thanks for sharing.
Nusrat Nargis

Assistant Professor
Daffodil International University

#### Shah Alam Kabir Pramanik

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##### Re: How to Use Stratified Sampling
« Reply #3 on: May 19, 2016, 04:12:09 PM »
Thanks for Sharing

#### Showrav.Yazdani

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##### Re: How to Use Stratified Sampling
« Reply #4 on: July 02, 2016, 09:37:33 PM »
Thanks for Sharing.
Regards,
Dewan G. Y. Showrav
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##### Re: How to Use Stratified Sampling
« Reply #5 on: July 03, 2016, 01:15:33 AM »
Research Friendly Post .........
Department of Real Estate
Daffodil International University

#### Rozina Akter

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##### Re: How to Use Stratified Sampling
« Reply #6 on: July 05, 2016, 10:56:23 AM »
thanks for sharing
Rozina Akter
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