Sampling Methods
Download as PPT, PDF4 likes1,176 views
The document discusses different sampling methods: 1) Convenience sampling selects population elements based on the researcher's judgement of what is representative. 2) Cluster random sampling divides the population into mutually exclusive clusters, randomly selects clusters, and then selects elements from the chosen clusters either all or through further probabilistic sampling. 3) An example is provided of how to conduct cluster random sampling by dividing a population map into clusters, assigning random numbers, selecting clusters based on rules like being divisible by 4, and repeating to get desired number of sub-clusters.
Sampling Methods
- 1. Sampling Methods Project Trimester-SS-2006/08
- 2. 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
- 3. 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.
- 4. Cluster Random Sampling Take the population map. Divide it into equal clusters Assign each cluster a random number. Select the cluster/s on the basis of a pre-decided rule. Divide the selected cluster into sub-clusters. Repeat steps 2-4 until you get a manageable sub-cluster.
- 5. Example
- 6. Divide Map/Population into clusters
- 7. 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
- 9. Rule: Numbers ending with 8 951428 927314 804 617017 763089 642931 641204 519153 779451 841581 10 141229 289898 276939 187605 914644 87739 382513 641936 408770 853741 9 399514 60307 397227 505272 998770 244519 509545 440308 726318 307442 8 484145 655607 213772 628139 231825 856150 185553 448950 788757 40342 7 656049 693121 93647 471453 517653 323149 20548 582305 767933 534017 6 70251 456047 206164 383865 902781 668902 258626 204669 891516 464092 5 921971 770869 52066 570811 702775 88556 479995 277732 500513 371968 4 921479 283993 754093 122798 22734 225104 517501 322797 171393 978317 3 470734 325846 920625 516687 99149 436461 923752 180700 243164 613663 2 52895 289377 352029 984050 68495 581353 431706 165126 719935 800968 1 J I H G F E D C B A Row #
- 10. Rule 2: Select cluster exactly divisible by 8
- 12. Thank You!!