Loading....
Coupon Accepted Successfully!

PSM

Open Flashcards

Biostatistics

Question
18 out of 76
 

True about cluster sampling is all except:



A Sample size same as simple random sampling

B Rapid method

C Independent of result

D Done for evaluating immunization status

Ans. A Sample size same as simple random sampling

Ref: Basic & Clinical Biostatistics; Dawson – Saunders & Trapp

  1. It is used when units of population are natural groups or clusters such as villages, wards, blocks, slums, and school.
  2. Cluster samples may be used when it is too expensive or laborious to draw a simple or stratified random sample; eg – in a survey in medical students in United states, an investigator may start by selecting a random set of groups or clusters – such as a random set of 10 medical schools in the USA.
  3. In cluster sampling the clusters are selected randomly, and all members in the cluster are sampled.
  4. This method is much more economical and practical than trying to take a random sample directly from the widely scattered population of all medical students in the United states.
  5. Cluster sampling gives a higher standard error but the data collection in this method is simpler and less expensive.
  6. Another disadvantage of this method of sampling is that inter-cluster comparison is not possible.
  7. Design effect is a phenomenon seen with cluster sampling and is the reason why sample size in cluster sampling is larger than that in simple random sampling.
  8. As per module approved by WHO, it is most often used to evaluate vaccination coverage in expanded programme of immunization or to find out missed cases in pulse polio immunization, a 30 / 7 (30 clusters with 7 subjects in each) cluster technique is used.

Biostatistics Flashcard List

76 flashcards
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
11)
12)
13)
14)
15)
16)
17)
18)
19)
20)
21)
22)
23)
24)
25)
26)
27)
28)
29)
30)
31)
32)
33)
34)
35)
36)
37)
38)
39)
40)
41)
42)
43)
44)
45)
46)
47)
48)
49)
50)
51)
52)
53)
54)
55)
56)
57)
58)
59)
60)
61)
62)
63)
64)
65)
66)
67)
68)
69)
70)
71)
72)
73)
74)
75)
76)