Sampling Methods

Sampling Methods

Project Trimester-SS-2006/08

Convenience Sampling

• Population elements are selected based on the judgement of the researcher.

• Chooses the elements to be included because he/she believes they are representative of the population

Cluster Random Sampling

• The target population is divided into mutually exclusive and collectively exhaustive clusters or sub-populations.

• Then a random sample of clusters is selected

• For each selected cluster, either all the elements are selected or a sample of elements is drawn probabilistically.


1. Take the population map.2. Divide it into equal clusters3. Assign each cluster a random number.4. Select the cluster/s on the basis of a

pre-decided rule.5. Divide the selected cluster into sub-

clusters.6. Repeat steps 2-4 until you get a

manageable sub-cluster.

Example

Divide Map/Population into clusters

Assign Random numbers

• http://www.graphpad.com/quickcalcs/randomn2.cfm

• Select Random numbers on basis of pre-decided rules. E.g. only even numbers

• Select 1 or more clusters on basis of pre-decided rules e.g. Divisible by 4

• Repeat till you get desired number of clusters/sub-clusters

• Rule: Numbers ending with 8

Row # A B C D E F G H I J

1 800968 719935 165126 431706 581353 68495 984050 352029 289377 52895

2 613663 243164 180700 923752 436461 99149 516687 920625 325846 470734

3 978317 171393 322797 517501 225104 22734 122798 754093 283993 921479

4 371968 500513 277732 479995 88556 702775 570811 52066 770869 921971

5 464092 891516 204669 258626 668902 902781 383865 206164 456047 70251

6 534017 767933 582305 20548 323149 517653 471453 93647 693121 656049

7 40342 788757 448950 185553 856150 231825 628139 213772 655607 484145

8 307442 726318 440308 509545 244519 998770 505272 397227 60307 399514

9 853741 408770 641936 382513 87739 914644 187605 276939 289898 141229

10 841581 779451 519153 641204 642931 763089 617017 804 927314 951428

• Rule 2: Select cluster exactly divisible by 8

800968 100121.0000371968 46496.0000726318 90789.7500440308 55038.500020548 2568.5000

122798 15349.7500289898 36237.2500951428 118928.5000

Project Sampling MethodCluster Random Sampling








Cluster Random SamplingStudy of consumer behaviour towards

ready-to-eat/semi processed food

Understanding the attributes of C Segment in the minds of the users of B

Segment/hatchback cars

Understanding the attributes of C Segment in the minds of the users of B

Segment/hatchback cars

Study of consumer behaviour towards Dove in specific and other premium

soaps in general

Segmentation of readymade menswear market in Ahmedabad

Segmentation of packaged Tea Market in Gujarat

Study of consumer behaviour towards various entertainment facilities in

western Ahmedabad

Study of the positioning of different GSM Services in Gujarat

Study of the positioning of different GSM Services in Gujarat

Business

Sampling Methods