Persampelan Bola Salji

Tinggalkan komen

Januari 23, 2017 oleh ustazkenali

Terdapat banyak cara untuk memilih sampel kajian. Keadaan in bergantung kepada fokus sesuatu kajian sama ada senang atau susah untuk mengesan atau mencari sampel yang sesuai.

In sociology and statistics research, snowball sampling[1] (or chain sampling, chain-referral sampling, referral sampling[2][3]) is a non-probability sampling technique where existing study subjects recruit future subjects from among their acquaintances. Thus the sample group is said to grow like a rolling snowball (similarly to breadth-first search (BFS) in computer science). As the sample builds up, enough data are gathered to be useful for research. This sampling technique is often used in hidden populations which are difficult for researchers to access; example populations would be drug users or sex workers. As sample members are not selected from a sampling frame, snowball samples, analogously to BFS samples,[4][5] are subject to numerous biases. For example, people who have many friends are more likely to be recruited into the sample.

It was widely believed that it was impossible to make unbiased estimates from snowball samples, but a variation of snowball sampling called respondent-driven sampling[6][7][8] has been shown to allow researchers to make asymptotically unbiased estimates from snowball samples under certain conditions. Snowball sampling and respondent-driven sampling also allows researchers to make estimates about the social network connecting the hidden population.

Secara ringkasnya, persampelan bola salji ialah penyelidik memilih terus beberapa sampel yang mempunyai ciri-ciri yang ditentukan Dan dari maklumat sampel pertama penyelidik gunakan untuk mendapatkan maklumat sampel kedua dan seterusnya ( berantai) sehingga lengkap jumlah sampel yang diperlukan. Kalau tak faham juga ingat lagu ” Bangau oh bangau “

References

 

1.Goodman, L.A. (1961). “Snowball sampling”. Annals of Mathematical Statistics. 32 (1): 148–170. doi:10.1214/aoms/1177705148.

2.  “Snowball Sampling”. Experiment-resources.com.

3. Snowball Sampling, Changing Minds.org, http://changingminds.org/explanations/research/sampling/snowball_sampling.

 

4. Kurant, M.; Markopoulou, A.; Thiran., P. (2010). On the bias of BFS (Breadth First Search). International Teletraffic Congress (ITC 22). arXiv:1004.1729Freely accessible.

5. Kurant, M.; Markopoulou, A.; Thiran., P. (2011). “Towards Unbiased BFS Sampling”. IEEE JSAC. 29 (9): 1799–1809. arXiv:1102.4599Freely accessible. doi:10.1109/jsac.2011.111005.

6. Heckathorn, D.D. (1997). “Respondent-Driven Sampling: A New Approach to the Study of Hidden Populations”. Social Problems. 44 (2): 174–199. doi:10.1525/sp.1997.44.2.03x0221m.

7. Salganik, M.J. and D.D. Heckathorn (2004). “Sampling and Estimation in Hidden Populations Using Respondent-Driven Sampling”. Sociological Methodology. 34 (1): 193–239. doi:10.1111/j.0081-1750.2004.00152.x.

8. Heckathorn, D.D. (2002). “Respondent-Driven Sampling II: Deriving Valid Estimates from Chain-Referral Samples of Hidden Populations”. Social Problems. 49 (1): 11–34. doi:10.1525/sp.2002.49.1.11.

 

 

 

Advertisements

Tinggalkan Jawapan

Masukkan butiran anda dibawah atau klik ikon untuk log masuk akaun:

WordPress.com Logo

Anda sedang menulis komen melalui akaun WordPress.com anda. Log Out / Tukar )

Twitter picture

Anda sedang menulis komen melalui akaun Twitter anda. Log Out / Tukar )

Facebook photo

Anda sedang menulis komen melalui akaun Facebook anda. Log Out / Tukar )

Google+ photo

Anda sedang menulis komen melalui akaun Google+ anda. Log Out / Tukar )

Connecting to %s

Januari 2017
I S R K J S A
« Nov   Feb »
 1
2345678
9101112131415
16171819202122
23242526272829
3031  

Blog Stats

  • 730,123 hits

Enter your email address to subscribe to this blog and receive notifications of new posts by email.

Join 60 other followers

Kategori

Top Rated

Top Clicks

  • Tiada
%d bloggers like this: